PhD, The University of Tokyo

LED

Ultrafast Laser spectroscopy

Photoexcited Carrier Dynamics

高速レーザー分光

光励起キャリアダイナミクス

Perovskite Solar Cell

ペロブスカイト太陽電池

Quantum Dot Solar Cell

Quantum Dot Solar Cell

solar cells

metal nanoparticles

semiconductor quantum dots

Thermal properties of condensed matter

Energy conversion

Optical properties

熱物性

光電エネルギー変換

光物性

金属ナノ粒子

半導体ナノ粒子

有機・無機ハイブリット太陽電池

Nanotechnology/Materials, Applied physics - general

Nanotechnology/Materials, Nanomaterials

Mar. 1995
The University of Tokyo, Graduate School, Division of Engineering, 応用化学専攻

Jul. 1989
中国南京大学, 情報物理学研究科, 音響学専攻, China

Jul. 1987
中国南京大学, Faculty of Science, 物理学科, China

Apr. 2022 - Mar. 2024
理事, 応用物理学会

Mar. 2014
Japan Society of Applied Physics
Excellent Women Scientist Award of The Japan Society of Applied Physics

Nov. 2003
Young Scientist Award of The Symposium on Ultrasonic Electronics

Oct. 2003
Best Paper Award of The Japan Society of Thermophysical Properties

Oct. 1997
Young Scientist Award of The Japan Society of Applied Physics

Overcoming efficiency and cost barriers for large-area quantum dot photovoltaics through stable ink engineering
Guozheng Shi; Xiaobo Ding; Zeke Liu; Yang Liu; Yifan Chen; Cheng Liu; Zitao Ni; Haibin Wang; Katsuji Ito; Keisuke Igarashi; Kun Feng; Kaicheng Zhang; Larry Lüer; Wei Chen; Xingyi Lyu; Bin Song; Xiang Sun; Lin Yuan; Dong Liu; Yusheng Li; Kunyuan Lu; Wei Deng; Youyong Li; Peter Müller-Buschbaum; Tao Li; Jun Zhong; Satoshi Uchida; Takaya Kubo; Ning Li; Joseph M. Luther; Hiroshi Segawa; Qing Shen; Christoph J. Brabec; Wanli Ma
Corresponding, Nature Energy, Springer Science and Business Media LLC, 07 Apr. 2025, Peer-reviwed
Scientific journal, English

Lead-Free Perovskite Tandem Solar Cells with Wide Bandgap Tin Perovskite and CIGS
Hua̅n Bì; Zheng Zhang; Takeshi Kitamura; Gaurav Kapil; Ajay Kumar Baranwal; Mengmeng Chen; Liang Wang; Jiaqi Liu; Qing Shen; Shuzi Hayase
Corresponding, ACS Energy Letters, American Chemical Society (ACS), 2133-2142, 03 Apr. 2025, Peer-reviwed
Scientific journal

Synthesis of p-type PbS quantum dot ink via inorganic ligand exchange in solution for high-efficiency and stable solar cells
Napasuda Wichaiyo; Yuyao Wei; Chao Ding; Guozheng Shi; Witoon Yindeesuk; Liang Wang; Huān Bì; Jiaqi Liu; Shuzi Hayase; Yusheng Li; Yongge Yang; Qing Shen
Corresponding, Journal of Semiconductors, IOP Publishing, 46, 4, 042104-042104, 01 Apr. 2025, Peer-reviwed, Abstract

Traditional p-type colloidal quantum dot (CQD) hole transport layers (HTLs) used in CQD solar cells (CQDSCs) are commonly based on organic ligands exchange and the layer-by-layer (LbL) technique. Nonetheless, the ligand detachment and complex fabrication process introduce surface defects, compromising device stability and efficiency. In this work, we propose a solution-phase ligand exchange (SPLE) method utilizing inorganic ligands to develop stable p-type lead sulfide (PbS) CQD inks for the first time. Various amounts of tin (II) iodide (SnI₂) were mixed with lead halide (PbX₂; X = I, Br) in the ligand solution. By precisely controlling the SnI₂ concentration, we regulate the transition of PbS QDs from n-type to p-type. PbS CQDSCs were fabricated using two different HTL approaches: one with 1,2-ethanedithiol (EDT)-passivated QDs via the LbL method (control) and another with inorganic ligand-passivated QD ink (target). The target devices achieved a higher power conversion efficiency (PCE) of 10.93%, compared to 9.83% for the control devices. This improvement is attributed to reduced interfacial defects and enhanced carrier mobility. The proposed technique offers an efficient pathway for producing stable p-type PbS CQD inks using inorganic ligands, paving the way for high-performance and flexible CQD-based optoelectronic devices.
Scientific journal

Colloidal synthesis of lead chalcogenide/lead chalcohalide core/shell nanostructures and structural evolution
Yang Liu; Kunyuan Lu; Yujie Zhu; Xudong Hu; Yusheng Li; Guozheng Shi; Xingyu Zhou; Lin Yuan; Xiang Sun; Xiaobo Ding; Irfan Ullah Muhammad; Qing Shen; Zeke Liu; Wanli Ma
Journal of Semiconductors, IOP Publishing, 46, 4, 042101-042101, 01 Apr. 2025, Peer-reviwed, Abstract

Lead chalcohalides (PbYX, X = Cl, Br, I; Y = S, Se) is an extension of the classic Pb chalcogenides (PbY). Constructing the heterogeneous integration with PbYX and PbY material systems makes it possible to achieve significantly improved optoelectronic performance. In this work, we studied the effect of introducing halogen precursors on the structure of classical PbS nanocrystals (NCs) during the synthesis process and realized the preparation of PbS/Pb₃S₂X₂ core/shell structure for the first time. The core/shell structure can effectively improve their optical properties. Furthermore, our approach enables the synthesis of Pb₃S₂Br₂ that had not yet been reported. Our results not only provide valuable insights into the heterogeneous integration of PbYX and PbY materials to elevate material properties but also provide an effective method for further expanding the preparation of PbYX material systems.
Scientific journal

Technical Routes to Achieve High Circular Polarized Luminescence in Chiral Perovskites: A Mini‐Review
Yongge Yang; Zhao Yang; Qing Shen; Joseph J. Berry; Peng Du
Advanced Physics Research, Wiley, 07 Jan. 2025, Peer-reviwed, Abstract

Chiral hybrid organic‐inorganic perovskites (HOIPs) have emerged as promising materials for optoelectronic and spintronic applications, leveraging unique properties such as circularly polarized luminescence (CPL), circularly polarized nonlinear optical (NLO) emission, and chiral‐induced spin selectivity (CISS). However, challenges remain in stabilizing these materials under environmental stresses and precisely controlling chirality for scalable use. This review summarizes five main strategies to induce chirality in HOIPs, i.e., direct incorporation of chiral cations, surface modification with chiral ligands, ion doping, template‐induced chirality, and chiral metasurfaces. Each approach offers distinct advantages for optimizing CPL efficiency and device stability, paving the way for next‐generation applications in CPL detectors, information encryption, spintronic devices, etc.
Scientific journal

Exceeding 15% Performance with Energy Level Tuning in Tin-Based Perovskite Solar Cells
Liang Wang; Huan Bi; Jiaqi Liu; Yuyao Wei; Zheng Zhang; Mengmeng Chen; Ajay Kumar Baranwal; Gaurav Kapil; Takeshi Kitamura; Shuzhang Yang; Qingqing Miao; Qing Shen; Tingli Ma; Shuzi Hayase
Corresponding, ACS Energy Letters, American Chemical Society (ACS), 9, 12, 6238-6244, 05 Dec. 2024, Peer-reviwed
Scientific journal

Diffusion-mediated synthesis of high-quality organic–inorganic hybrid perovskite nanocrystals
Xiang Sun; Lin Yuan; Yang Liu; Guozheng Shi; Yumin Wang; Chunmeng Liu; Xuliang Zhang; Yaxin Zhao; Chenyu Zhao; Mengmeng Ma; Boyuan Shen; Yaxing Wang; Qing Shen; Zeke Liu; Wanli Ma
Nature Synthesis, Springer Science and Business Media LLC, 4, 2, 167-176, 14 Nov. 2024, Peer-reviwed
Scientific journal

Electronic Coupling Between Perovskite Nanocrystal and Fullerene Modulates Hot Carrier Capture
Yusheng Li; Junke Jiang; Dandan Wang; Dong Liu; Shota Yajima; Hua Li; Akihito Fuchimoto; Hongshi Li; Guozheng Shi; Shuzi Hayase; Shuxia Tao; Jiangjian Shi; Qingbo Meng; Chao Ding; Qing Shen
Corresponding, Advanced Functional Materials, Wiley, 35, 8, 05 Nov. 2024, Peer-reviwed, Abstract

The efficient harnessing of hot carriers holds transformative potential for next‐generation optoelectronic devices. Halide perovskites, with their remarkably long carrier lifetimes exceeding 10 picoseconds, stand at the forefront of this research frontier. Yet, a fundamental paradox persists: why does efficient hot carrier capture remain elusive despite these extended lifetimes? Here, this conundrum is unraveled by constructing a donor–acceptor model system: perovskite nanocrystal and fullerene hybrids. It is demonstrated that the challenge lies not only in the carrier lifetime itself but in the nature of the coupling between donor and acceptor components. Remarkably, it is discovered that the formation of ground‐state complexes, with effective coupling across a wide energy range, not only overcomes the initially forbidden hot carrier capture within these hybrids but also dramatically enhances it, achieving a ≈76% hot carrier capture efficiency. This finding shifts the paradigm of hot carrier capture from extending carrier lifetimes to engineering donor–acceptor coupling, illuminating a path toward practical hot carrier applications.
Scientific journal

Carboxylate Pseudo-Halide-Assisted crystallization and antioxidant strategy for stable wide bandgap tin perovskite photovoltaics
Sung Won Cho; Hochan Song; Padmini Pandey; Seong Chan Cho; Saemon Yoon; Woo Hyeon Jeong; Hyungju Ahn; Seojun Lee; Jeong Yeon Lee; Qing Shen; Sang Uck Lee; Hyosung Choi; Dong Won Kang
Chemical Engineering Journal, 497, 01 Oct. 2024, Peer-reviwed
Scientific journal

The Application of Metallic Sn in Sn-Based Perovskite Solar Cells
Liang Wang; Hong Zhang; Qing Shen; Shuzi Hayase
Corresponding, ChemNanoMat, 10, 10, Oct. 2024, Peer-reviwed
Scientific journal

Enhanced Electron Transport in Heterojunction Sn-Perovskite Solar Cells Assisted by [6,6]-Phenyl-C61-butyric Acid Methyl Ester as a Dopant
Ajay Kumar Baranwal; Huan Bi; Gaurav Kapil; Takeshi Kitamura; Liang Wang; Jiaqi Liu; Qing Shen; Shuzi Hayase
ACS Energy Letters, 9, 8, 4119-4126, 09 Aug. 2024, Peer-reviwed
Scientific journal

Double side passivation of phenylethyl ammonium iodide for all perovskite tandem solar cell with efficiency of 26.8%
Huan Bi; Jiaqi Liu; Liang Wang; Zheng Zhang; Gaurav Kapil; Shahrir Razey Sahamir; Ajay Kumar Baranwal; Yuyao Wei; Yongge Yang; Dandan Wang; Takeshi Kitamura; Hiroshi Segawa; Qing Shen; Shuzi Hayase
Corresponding, EcoEnergy, Wiley, 02 Jul. 2024, Peer-reviwed, Abstract

All‐perovskite tandem solar cells are regarded as the next generation of devices capable of enhancing the solar energy utilization rate. Unlike single‐junction perovskite solar cells (PSCs), the efficacy of tandem cells is contingent upon the performance of both the top and bottom cells. In this study, we employed a simultaneous co‐modification strategy to incorporate phenylethylammonium iodide (PEAI) at both the top and bottom interfaces of the perovskite film, aiming to boost the top cell's performance. Both experimental and theoretical findings indicate that PEAI not only elevates the perovskite film quality through chemical interactions but also mitigates nonradiative recombination within the device. Consequently, the efficiency of the wide‐bandgap (1.77 eV) PSCs based on nickel oxide (NiO_x) attained a level of 16.5%. Simultaneously, the all‐perovskite tandem solar cells achieved an efficiency of 26.81% and demonstrated superior stability.
Scientific journal

Restraining Photocurrent Loss of Lead-Free Perovskite Solar Cells by Regulating Surficial Hydroxyl of Fluorine-Doped Tin Oxide
Jiaqi Liu; Huan Bi; Zheng Zhang; Yasuhiro Fujiwara; Yoshitaka Sanehira; Gaurav Kapil; Takeshi Kitamura; Shahrir Razey Sahamir; Ajay Kumar Baranwal; Liang Wang; Qing Shen; Shuzi Hayase
Corresponding, ACS Applied Energy Materials, 7, 11, 4779-4785, 10 Jun. 2024, Peer-reviwed
Scientific journal

Midgap states and energy alignment at interconnect are crucial for perovskite tandem solar cells
Gaurav Kapil; Yasuhiro Fujiwara; Huan Bi; Ajay Kumar Baranwal; Shahrir Razey Sahamir; Jiaqi Liu; Liang Wang; Daisuke Hirotani; Qing Shen; Hiroshi Segawa; Shuzi Hayase
Cell Reports Physical Science, Elsevier BV, 5, 7, 102060-102060, Jun. 2024, Peer-reviwed
Scientific journal

Elucidating the Mechanisms of the Large Stokes Shift in Isolated and Coupled PbS Quantum Dots
Hua Li; Chao Ding; Naoki Oguri; Yuuya Makino; Dong Liu; Yao Guo; Yuyao Wei; Yusheng Li; Yongge Yang; Dandan Wang; Shikai Chen; Taizo Masuda; Shuzi Hayase; Tomah Sogabe; Qing Shen
Corresponding, Journal of Physical Chemistry C, 128, 21, 8732-8740, 30 May 2024, Peer-reviwed
Scientific journal

Photoexcited Carrier Dynamics in Iodine-Doped CH3NH3PbBr3 Single Crystals
Dong Liu; Chao Ding; Yao Guo; Hua Li; Yusheng Li; Dandan Wang; Yongge Yang; Yuyao Wei; Shikai Chen; Guozheng Shi; Taro Toyoda; Dong Won Kang; Shuzi Hayase; Qing Shen
Corresponding, Journal of Physical Chemistry Letters, 15, 21, 5618-5624, 30 May 2024, Peer-reviwed
Scientific journal

Stronger Coupling of Quantum Dots in Hole Transport Layer Through Intermediate Ligand Exchange to Enhance the Efficiency of PbS Quantum Dot Solar Cells
Yuyao Wei; Chao Ding; Guozheng Shi; Huan Bi; Yusheng Li; Hua Li; Dong Liu; Yongge Yang; Dandan Wang; Shikai Chen; Ruixiang Wang; Shuzi Hayase; Taizo Masuda; Qing Shen
Corresponding, Small Methods, Wiley, 12 Apr. 2024, Peer-reviwed
Scientific journal

Highly Luminescent Phase-Stable Hybrid Manganese Halides for Efficient X-ray Imaging
Sujun Ji; Yihang Liu; Yulong Wang; Hongyuan Zhao; Qiujie Wang; Qichao Meng; Yunfei Bai; Junke Jiang; Qing Shen; Feng Liu
Crystal Growth and Design, 24, 5, 2094-2103, 06 Mar. 2024, Peer-reviwed
Scientific journal

Achieving High Efficiency and Enhanced Thermal Stability in Germanium-Encapsulated Tin–Lead Perovskite Solar Cells
Shahrir Razey Sahamir; Gaurav Kapil; Takeru Bessho; Hiroshi Segawa; Qing Shen; Shuzi Hayase
ACS Materials Letters, American Chemical Society (ACS), 6, 4, 1241-1246, 04 Mar. 2024, Peer-reviwed
Scientific journal

Adhesion, stability, structural and electronic properties of perovskite/BaWO₄ heterostructures: first-principles and experimental characterizations
Yao Guo; Shiding Zhang; Zhaoyu Zhang; Yuanbin Xue; Jianxin Li; Haixiang Song; Yuhua Wang; Qing Shen
Corresponding, Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), 11, 9, 2661-2671, Mar. 2024, Peer-reviwed
Scientific journal

Over 14% efficiency of highly reproducible Sn perovskite solar cell via defect passivation and morphology repairment
Zheng Zhang; Jiaqi Liu; Huan Bi; Liang Wang; Qing Shen; Shuzi Hayase
Corresponding, Chemical Engineering Journal, Elsevier BV, 483, 149345-149345, Mar. 2024, Peer-reviwed
Scientific journal

Tandem Synergistic Effect of Cu-In Dual Sites Confined on the Edge of Monolayer CuInP2S6 toward Selective Photoreduction of CO2 into Multi-Carbon Solar Fuels
Wa Gao; Li Shi; Wentao Hou; Cheng Ding; Qi Liu; Ran Long; Haoqiang Chi; Yongcai Zhang; Xiaoyong Xu; Xueying Ma; Zheng Tang; Yong Yang; Xiaoyong Wang; Qing Shen; Yujie Xiong; Jinlan Wang; Zhigang Zou; Yong Zhou
Angewandte Chemie - International Edition, 63, 9, 26 Feb. 2024, Peer-reviwed
Scientific journal

Classifying the Role of Surface Ligands on the Passivation and Stability of Cs2NaInCl6 Double Perovskite Quantum Dots
Keita Tosa; Chao Ding; Shikai Chen; Shuzi Hayase; Qing Shen
Corresponding, Nanomaterials, MDPI AG, 14, 4, 376-376, 17 Feb. 2024, Peer-reviwed
Scientific journal

In situ synergistic halogen passivation of semiconducting PbS quantum dot inks for efficient photovoltaics
Xiaobo Ding; Xin Wen; Yuto Kawata; Yang Liu; Guozheng Shi; Refka ben Ghazi; Xiang Sun; Yujie Zhu; Hao Wu; Haotian Gao; Qing Shen; Zeke Liu; Wanli Ma
Nanoscale, Royal Society of Chemistry (RSC), 16, 10, 5115-5122, Feb. 2024, Peer-reviwed
Scientific journal

Stable Inorganic Colloidal Tin and Tin–Lead Perovskite Nanocrystals with Ultralong Carrier Lifetime via Sn(IV) Control
Yusheng Li; Dandan Wang; Yongge Yang; Chao Ding; Yuyu Hu; Feng Liu; Yuyao Wei; Dong Liu; Hua Li; Guozheng Shi; Shikai Chen; Hongshi Li; Akihito Fuchimoto; Keita Tosa; Unno Hiroki; Shuzi Hayase; Huiyun Wei; Qing Shen
Corresponding, Journal of the American Chemical Society, American Chemical Society (ACS), 146, 5, 3094-3101, 25 Jan. 2024, Peer-reviwed
Scientific journal

Deciphering the Atomic-Scale Structural Origin for Photoluminescence Quenching in Tin-Lead Alloyed Perovskite Nanocrystals
Dandan Wang; Yusheng Li; Yongge Yang; Yao Guo; Huiyun Wei; Feng Liu; Chao Ding; Yuyao Wei; Dong Liu; Hua Li; Guozheng Shi; Shikai Chen; Hongshi Li; Akihito Fuchimoto; Jing Xia; Shuzi Hayase; Qing Shen
Corresponding, ACS Nano, 2024, Peer-reviwed
Scientific journal

Energetic disorder dominates optical properties and recombination dynamics in tin-lead perovskite nanocrystals
Dandan Wang; Yusheng Li; Yongge Yang; Chao Ding; Yuyao Wei; Dong Liu; Hua Li; Huan Bi; Shikai Chen; Sujun Ji; Boyu Zhang; Yao Guo; Huiyun Wei; Hongshi Li; Shuzi Hayase; Qing Shen
Corresponding, eScience, 2024, Peer-reviwed
Scientific journal

Ternary Passivation for Enhanced Carrier Transport and Recombination Suppression in Highly Efficient Sn-Based Perovskite Solar Cells
Liang Wang; Qingqing Miao; Dandan Wang; Zheng Zhang; Mengmeng Chen; Huan Bi; Jiaqi Liu; Ajay Kumar Baranwal; Gaurav Kapil; Yoshitaka Sanehira; Takeshi Kitamura; Qing Shen; Tingli Ma; Shuzi Hayase
Corresponding, Small, 2024, Peer-reviwed
Scientific journal

Photoacoustic Characterization of Photovoltaic Materials
Taro TOYODA; Qing SHEN
The Journal of The Institute of Electrical Engineers of Japan, Institute of Electrical Engineers of Japan (IEE Japan), 144, 1, 14-17, 01 Jan. 2024, Peer-reviwed
Scientific journal

In Situ Room-Temperature Synthesis of All-Colloidal Quantum Dot CsPbBr₃–PbS Heterostructures
Yongge Yang; Dandan Wang; Yusheng Li; Jing Xia; Huiyun Wei; Chao Ding; Yuyu Hu; Yuyao Wei; Hua Li; Dong Liu; Guozheng Shi; Yaohong Zhang; Huan Bi; Shikai Chen; Hongshi Li; Xiang-Min Meng; Shuzi Hayase; Qing Shen
Corresponding, ACS Photonics, American Chemical Society (ACS), 10, 12, 4305-4314, 20 Nov. 2023, Peer-reviwed
Scientific journal

Anchoring self-assembled monolayer at perovskite/hole collector interface for wide bandgap Sn-based solar cells with a record efficiency over 12%
SungWon Cho; Padmini Pandey; Saemon Yoon; Jun Ryu; Dong-Gun Lee; Qing Shen; Shuzi Hayase; Hochan Song; Hyosung Choi; Hyungju Ahn; Chang-Mok Oh; In-Wook Hwang; Jung Sang Cho; Dong-Won Kang
Surfaces and Interfaces, Elsevier BV, 42, 103478-103478, Nov. 2023, Peer-reviwed
Scientific journal

Ferrocene Derivatives for Improving the Efficiency and Stability of MA‐Free Perovskite Solar Cells from the Perspective of Inhibiting Ion Migration and Releasing Film Stress
Huan Bi; Jiaqi Liu; Zheng Zhang; Liang Wang; Gaurav Kapil; Yuyao Wei; Ajay Kumar Baranwal; Shahrir Razey Sahamir; Yoshitaka Sanehira; Dandan Wang; Yongge Yang; Takeshi Kitamura; Raminta Beresneviciute; Saulius Grigalevicius; Qing Shen; Shuzi Hayase
Corresponding, Advanced Science, Wiley, 10, 35, 22 Oct. 2023, Peer-reviwed, Abstract

Further improvement of the performance and stability of inverted perovskite solar cells (PSCs) is necessary for commercialization. Here, ferrocene derivative dibenzoylferrocene (DBzFe) is used as an additive to enhance the performance and stability of MA‐ and Br‐ free PSCs. The results show that the introduction of DBzFe not only passivates the defects in the film but also inhibits the ion migration in the film. The final device achieves a power conversion efficiency (PCE) of 23.53%, which is one of the highest efficiencies currently based on self‐assembled monolayers (SAMs). Moreover, it maintains more than 96.4% of the original efficiency when running continuously for 400 h at the maximum power point.
Scientific journal

All-Perovskite Tandem Solar Cells Approach 26.5% Efficiency by Employing Wide Bandgap Lead Perovskite Solar Cells with New Monomolecular Hole Transport Layer
Huan Bi; Jiaqi Liu; Zheng Zhang; Liang Wang; Raminta Beresneviciute; Daiva Tavgeniene; Gaurav Kapil; Chao Ding; Ajay Kumar Baranwal; Shahrir Razey Sahamir; Yoshitaka Sanehira; Hiroshi Segawa; Saulius Grigalevicius; Qing Shen; Shuzi Hayase
Corresponding, ACS Energy Letters, American Chemical Society (ACS), 8, 9, 3852-3859, 24 Aug. 2023, Peer-reviwed
Scientific journal

Efficiency Enhancement of Wide Bandgap Lead Perovskite Solar Cells with PTAA Surface-Passivated with Monomolecular Layer from the Viewpoint of PTAA Band Bending
Huan Bi; Jiaqi Liu; Raminta Beresneviciute; Daiva Tavgeniene; Zheng Zhang; Liang Wang; Gaurav Kapil; Chao Ding; Shahrir Razey Sahamir; Yoshitaka Sanehira; Ajay Kumar Baranwal; Takeshi Kitamura; Dandan Wang; Yuyao Wei; Yongge Yang; Dong-Won Kang; Saulius Grigalevicius; Qing Shen; Shuzi Hayase
Corresponding, ACS Applied Materials & Interfaces, 22 Aug. 2023, Peer-reviwed
Scientific journal

14.31 % Power Conversion Efficiency of Sn‐Based Perovskite Solar Cells via Efficient Reduction of Sn4+
Liang Wang; Qingqing Miao; Dandan Wang; Mengmeng Chen; Huan Bi; Jiaqi Liu; Ajay Kumar Baranwal; Gaurav Kapil; Yoshitaka Sanehira; Takeshi Kitamura; Tingli Ma; Zheng Zhang; Qing Shen; Shuzi Hayase
Corresponding, Angewandte Chemie, 14 Aug. 2023, Peer-reviwed
Scientific journal

Enhancement of Efficiency and Stability for Tin Halide Perovskite Solar Cells by Using Improved Doping Method
Zheng Zhang; Liang Wang; Huan Bi; Ajay Kumar Baranwal; Gaurav Kapil; Yoshitaka Sanehira; Jiaqi Liu; Dong Liu; Qing Shen; Shuzi Hayase
Corresponding, Advanced Optical Materials, Wiley, 12, 2, 13 Aug. 2023, Peer-reviwed
Scientific journal

Sn Perovskite Solar Cells with Tin Oxide Nanoparticle Layer as Hole Transport Layer
Takeshi Kitamura; Liang Wang; Zheng Zhang; Ajay Kumar Baranwal; Gaurav Kapil; Shahrir Razey Sahamir; Yoshitaka Sanehira; Huan Bi; Tingli Ma; Qing Shen; Shuzi Hayase
ACS Energy Letters, American Chemical Society (ACS), 8, 8, 3565-3568, 31 Jul. 2023, Peer-reviwed
Scientific journal

How to minimize voltage and fill factor losses to achieve over 20% efficiency lead chalcogenide quantum dot solar cells: Strategies expected through numerical simulation
Dandan Wang; Yusheng Li; Yongge Yang; Shuzi Hayase; Haifeng Wu; Ruixiang Wang; Chao Ding; Qing Shen
Corresponding, Applied Energy, Elsevier BV, 341, 121124-121124, Jul. 2023, Peer-reviwed
Scientific journal

Enhanced Hot-Phonon Bottleneck Effect on Slowing Hot Carrier Cooling in Metal Halide Perovskite Quantum Dots With Alloyed A-Site.
Hua Li; Qing Wang; Yusuke Oteki; Chao Ding; Dong Liu; Yao Guo; Yusheng Li; Yuyao Wei; Dandan Wang; Yongge Yang; Taizo Masuda; Mengmeng Chen; Zheng Zhang; Tomah Sogabe; Shuzi Hayase; Yoshitaka Okada; Satoshi Iikubo; Qing Shen
Corresponding, Advanced materials (Deerfield Beach, Fla.), e2301834, 13 Jun. 2023, Peer-reviwed, True, A deep understanding of the effect of the A-site cation cross-exchange on the hot-carrier relaxation dynamics in perovskite quantum dots (PQDs) has profound implications on the further development of disruptive photovoltaic technologies. In this study, we investigated the hot carrier cooling kinetics of pure FAPbI3 , MAPbI3 , CsPbI3 and alloyed FA0.5 MA0.5 PbI3 , FA0.5 Cs0.5 PbI3 , and MA0.5 Cs0.5 PbI3 QDs using ultrafast transient absorption (TA) spectroscopy. The lifetimes of the initial fast cooling stage (<1 ps) of all the organic cation-containing PQDs were shorter than those of the CsPbI3 QDs, as verified by the electron-phonon coupling strength extracted from the temperature-dependent photoluminescence spectra. The lifetimes of the slow cooling stage of the alloyed PQDs were longer under illumination greater than 1 sun, which was ascribed to the introduction of co-vibrational optical phonon modes in the alloyed PQDs. This facilitated efficient acoustic phonon upconversion and enhanced the hot-phonon bottleneck effect, as demonstrated by first-principles calculations. This article is protected by copyright. All rights reserved.
Scientific journal, English

Low-Temperature Growth of ZnMgO Thin Films by Atmospheric Spin-Coating Using Diethylzinc Solution
Kenji Yoshino; Himeka Tominaga; Yuta Komaki; Masato Imai; Tomohiro Higashi; Takashi Minemoto; Qing Shen; Shuzi Hayase
Journal of Electronic Materials, Springer Science and Business Media LLC, 12 May 2023, Peer-reviwed
Scientific journal

Perovskite Solar Cells Consisting of PTAA Modified with Monomolecular Layer and Application to All‐Perovskite Tandem Solar Cells with Efficiency over 25%
Huan Bi; Yasuhiro Fujiwara; Gaurav Kapil; Daiva Tavgeniene; Zheng Zhang; Liang Wang; Chao Ding; Shahrir Razey Sahamir; Ajay Kumar Baranwal; Yoshitaka Sanehira; Kitamura Takeshi; Guozheng Shi; Takeru Bessho; Hiroshi Segawa; Saulius Grigalevicius; Qing Shen; Shuzi Hayase
Corresponding, Advanced Functional Materials, Wiley, 33, 32, 26 Apr. 2023, Peer-reviwed, Abstract

This study is on the enhancement of the efficiency of wide bandgap (FA_0.8Cs_0.2PbI_1.8Br_1.2) perovskite solar cells (PSCs) used as the top layer of the perovskite/perovskite tandem solar cell. Poly[bis(4‐phenyl) (2,4,6‐trimethylphenyl) amine] (PTAA) and the monomolecular layer called SAM layer are effective hole collection layers for APbI₃ PSCs. However, these hole transport layers (HTL) do not give high efficiencies for the wide bandgap FA_0.8Cs_0.2PbI_1.8Br_1.2 PSCs. It is found that the surface‐modified PTAA by monomolecular layer (MNL) improves the efficiency of PSCs. The improved efficiency is explained by the improved FA_0.8Cs_0.2PbI_1.8Br_1.2 film quality, decreased film distortion (low lattice disordering) and low density of the charge recombination site, and improves carrier collection by the surface modified PTAA layer. In addition, the relationship between the length of the alkyl group linking the anchor group and the carbazole group is also discussed. Finally, the wide bandgap lead PSCs (E_g = 1.77 eV) fabricated on the PTAA/monomolecular bilayer give a higher power conversion efficiency of 16.57%. Meanwhile, all‐perovskite tandem solar cells with over 25% efficiency are reported by using the PTAA/monomolecular substrate.
Scientific journal

A multifunctional additive strategy to stabilize the precursor solution and passivate film defects for MA-free perovskite solar cells with an efficiency of 22.75%
Huan Bi; Mengna Guo; Chao Ding; Shuzi Hayase; Qing Shen; Gaoyi Han; Wenjing Hou
Corresponding, Materials Today Energy, Elsevier BV, 33, 101269-101269, Apr. 2023, Peer-reviwed
Scientific journal

Reduced interfacial recombination losses and lead leakage in lead-based perovskite solar cells using 2D/3D perovskite engineering
Huan Bi; Yao Guo; Mengna Guo; Chao Ding; Shuzi Hayase; Hanjun Zou; Qing Shen; Gaoyi Han; Wenjing Hou
Journal of Power Sources, Elsevier BV, 563, 232825-232825, Apr. 2023, Peer-reviwed
Scientific journal

Efficient Charge Transfer in MAPbI₃ QDs/TiO₂ Heterojunctions for High-Performance Solar Cells
Hua Li; Chao Ding; Dong Liu; Shota Yajima; Kei Takahashi; Shuzi Hayase; Qing Shen
Corresponding, Nanomaterials, Apr. 2023, Peer-reviwed
Scientific journal

Open‐Shell Diradical‐Sensitized Electron Transport Layer for High‐Performance Colloidal Quantum Dot Solar Cells
Shiwen Fang; Jiaxing Huang; Ran Tao; Qi Wei; Xiaobo Ding; Shota Yajima; Zhongxin Chen; Weiya Zhu; Cheng Liu; Yusheng Li; Ni Yin; Leliang Song; Yang Liu; Guozheng Shi; Hao Wu; Yiyuan Gao; Xin Wen; Qi Chen; Qing Shen; Youyong Li; Zeke Liu; Yuan Li; Wanli Ma
Advanced Materials, Wiley, 35, 21, 30 Mar. 2023, Peer-reviwed, Abstract

The zinc oxide (ZnO) nanoparticles (NPs) are well‐documented as an excellent electron transport layer (ETL) in optoelectronic devices. However, the intrinsic surface flaw of the ZnO NPs can easily result in serious surface recombination of carriers. Exploring effective passivation methods of ZnO NPs is essential to maximize the device's performance. Herein, a hybrid strategy is explored for the first time to improve the quality of ZnO ETL by incorporating stable organic open‐shell donor‐acceptor type diradicaloids. The high electron‐donating feature of the diradical molecules can efficiently passivate the deep‐level trap states and improve the conductivity of ZnO NP film. The unique advantage of the radical strategy is that its passivation effectiveness is highly correlated with the electron‐donating ability of radical molecules, which can be precisely controlled by the rational design of molecular chemical structures. The well‐passivated ZnO ETL is applied in lead sulfide (PbS) colloidal quantum dot solar cells, delivering a power conversion efficiency of 13.54%. More importantly, as a proof‐of‐concept study, this work will inspire the exploration of general strategies using radical molecules to construct high‐efficiency solution‐processed optoelectronic devices.
Scientific journal

Pb-free perovskite solar cells composed of Sn/Ge(1:1) alloyed perovskite layer prepared by spin-coating
Huan Bi; Mengmeng Chen; Liang Wang; Zheng Zhang; Chao Ding; Gaurav Kapil; Shahrir Razey Sahamir; Yoshitaka Sanehira; Ajay Kumar Baranwal; Takeshi Kitamura; Guozheng Shi; Qing Shen; Shuzi Hayase
Corresponding, Applied Physics Express, IOP Publishing, 16, 3, 036501-036501, 01 Mar. 2023, Peer-reviwed, Abstract

Since the DMSO seriously oxidizes the GeI₂ which is one of the ingredients for the Sn/Ge perovskite, it was difficult to make high-quality films by using the conventional DMSO/DMF solvent. We now first report the MASn_0.5Ge_0.5I₃ perovskite solar cells (PSCs) prepared by a simple spin-coating technology. We found that triethanolamine (TEA)/n-methyl pyrrolidone (NMP) does not oxidize the GeI₂ and improves the stability of the precursor. The precursor solution with TEA/NMP/DMF gave high-quality perovskite films. The cell gave a power conversion efficiency of 2.18%. This is the first report proving that Sn/Ge PSCs are fabricated by a conventional solution process.
Scientific journal

Room-temperature photosynthesis of propane from CO2 with Cu single atoms on vacancy-rich TiO2
Yan Shen; Chunjin Ren; Lirong Zheng; Xiaoyong Xu; Ran Long; Wenqing Zhang; Yong Yang; Yongcai Zhang; Yingfang Yao; Haoqiang Chi; Jinlan Wang; Qing Shen; Yujie Xiong; Zhigang Zou; Yong Zhou
Nature Communications, Springer Science and Business Media LLC, 14, 1, 27 Feb. 2023, Peer-reviwed, Abstract

Photochemical conversion of CO₂ into high-value C₂₊ products is difficult to achieve due to the energetic and mechanistic challenges in forming multiple C-C bonds. Herein, an efficient photocatalyst for the conversion of CO₂ into C₃H₈ is prepared by implanting Cu single atoms on Ti_0.91O₂ atomically-thin single layers. Cu single atoms promote the formation of neighbouring oxygen vacancies (V_Os) in Ti_0.91O₂ matrix. These oxygen vacancies modulate the electronic coupling interaction between Cu atoms and adjacent Ti atoms to form a unique Cu-Ti-V_O unit in Ti_0.91O₂ matrix. A high electron-based selectivity of 64.8% for C₃H₈ (product-based selectivity of 32.4%), and 86.2% for total C₂₊ hydrocarbons (product-based selectivity of 50.2%) are achieved. Theoretical calculations suggest that Cu-Ti-V_O unit may stabilize the key *CHOCO and *CH₂OCOCO intermediates and reduce their energy levels, tuning both C₁-C₁ and C₁-C₂ couplings into thermodynamically-favourable exothermal processes. Tandem catalysis mechanism and potential reaction pathway are tentatively proposed for C₃H₈ formation, involving an overall (20e⁻ – 20H⁺) reduction and coupling of three CO₂ molecules at room temperature.
Scientific journal

Accelerating defect analysis of solar cells via machine learning of the modulated transient photovoltage
Yusheng Li; Yiming Li; Jiangjian Shi; Licheng Lou; Xiao Xu; Yuqi Cui; Jionghua Wu; Dongmei Li; Yanhong Luo; Huijue Wu; Qing Shen; Qingbo Meng
Fundamental Research, Elsevier BV, Feb. 2023, Peer-reviwed
Scientific journal

Simultaneous Characterization of Optical, Electronic, and Thermal Properties of Perovskite Single Crystals Using a Photoacoustic Technique
Dong Liu; Hua Li; Yusheng Li; Taro Toyoda; Koji Miyazaki; Shuzi Hayase; Chao Ding; Qing Shen
Corresponding, ACS Photonics, American Chemical Society (ACS), 10, 1, 265-273, 06 Jan. 2023, Peer-reviwed
Scientific journal

Merging Passivation in Synthesis Enabling the Lowest Open‐Circuit Voltage Loss for PbS Quantum Dot Solar Cells
Yang Liu; Hao Wu; Guozheng Shi; Yusheng Li; Yiyuan Gao; Shiwen Fang; Haodong Tang; Wei Chen; Tianshu Ma; Irfan Khan; Kai Wang; Changlei Wang; Xiaofeng Li; Qing Shen; Zeke Liu; Wanli Ma
Advanced Materials, Wiley, 35, 5, 20 Dec. 2022, Peer-reviwed, Abstract

The high open‐circuit voltage (V_oc) loss arising from insufficient surface passivation is the main factor that limits the efficiency of current lead sulfide colloidal quantum dots (PbS CQDs) solar cell. Here, synergistic passivation is performed in the direct synthesis of conductive PbS CQD inks by introducing multifunctional ligands to well coordinate the complicated CQDs surface with the thermodynamically optimal configuration. The improved passivation effect is intactly delivered to the final photovoltaic device, leading to an order lower surface trap density and beneficial doping behavior compared to the control sample. The obtained CQD inks show the highest photoluminescence quantum yield (PLQY) of 24% for all photovoltaic PbS CQD inks, which is more than twice the reported average PLQY value of ≈10%. As a result, a high V_oc of 0.71 V and power conversion efficiency (PCE) of 13.3% is achieved, which results in the lowest V_oc loss (0.35 eV) for the reported PbS CQD solar cells with PCE >10%, comparable to that of perovskite solar cells. This work provides valuable insights into the future CQDs passivation strategies and also demonstrates the great potential for the direct‐synthesis protocol of PbS CQDs.
Scientific journal

Unveiling of efficiency limit to fabricate high-performance PbSe quantum dot solar cells
Dandan Wang; Yusheng Li; Yongge Yang; Chao Ding; Qing Shen
Corresponding, SOLAR ENERGY, 247, 432-440, Nov. 2022, Peer-reviwed
Scientific journal, English

Ultrafast inverse design of quantum dot optical spectra via a joint TD-DFT learning scheme and deep reinforcement learning
Hibiki Yoshida; Katsuyoshi Sakamoto; Naoya Miyashita; Koichi Yamaguchi; Qing Shen; Yoshitaka Okada; Tomah Sogabe
AIP Advances, AIP Publishing, 12, 11, 115316-115316, Nov. 2022, Peer-reviwed, Here, we report a case study on inverse design of quantum dot optical spectra using a deep reinforcement learning algorithm for the desired target optical property of semiconductor Cd _xSe _yTe _{x− y} quantum dots. Machine learning models were trained to predict the optical absorption and emission spectra by using the training dataset by time dependent density functional theory simulation. We show that the trained deep deterministic policy gradient inverse design agent can infer the molecular structure with an accuracy of less than 1 Å at a fixed computational time of milliseconds and up to 100–1000 times faster than the conventional heuristic particle swam optimization method. Most of the effective inverse design problems based on the surrogate machine learning and reinforcement learning model have been focused on the field of nano-photonics. Few attempts have been made in the field of quantum optical system in a similar manner. For the first time, our results, to our knowledge, provide concrete evidence that for computationally challenging tasks, a well-trained deep reinforcement learning agent can replace the existing quantum simulation and heuristics optimization tool, enabling fast and scalable simulations of the optical property of nanometer sized semiconductor quantum dots.
Scientific journal

SnOx as Bottom Hole Extraction Layer and Top In Situ Protection Layer Yields over 14% Efficiency in Sn-Based Perovskite Solar Cells
Liang Wang; Mengmeng Chen; Shuzhang Yang; Namiki Uezono; Qingqing Miao; Gaurav Kapil; Ajay Kumar Baranwal; Yoshitaka Sanehira; Dandan Wang; Dong Liu; Tingli Ma; Kenichi Ozawa; Takeaki Sakurai; Zheng Zhang; Qing Shen; Shuzi Hayase
ACS Energy Lett., 8, 3703-3708, 03 Oct. 2022, Peer-reviwed
Scientific journal, English

Sequential Passivation for Lead-Free Tin Perovskite Solar Cells with High Efficiency
Zheng Zhang; Muhammad Akmal Kamarudin; Ajay Kumar Baranwal; Gaurav Kapil; Shahrir Razey Sahamir; Yoshitaka Sanehira; Mengmeng Chen; Liang Wang; Qing Shen; Shuzi Hayase
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 61, 42, Oct. 2022
Scientific journal, English

How to get high-efficiency lead chalcogenide quantum dot solar cells?
Chao Ding; Qing Shen
Science China Physics, Mechanics & Astronomy volume, 66, 217303, 16 Sep. 2022, Peer-reviwed
Scientific journal, English

Efficient Exciton Dislocation and Ultrafast Charge Extraction in CsPbI3 Perovskite Quantum Dots by Using Fullerene Derivative as Semiconductor Ligand
Yusheng Li; Dandan Wang; Shuzi Hayase; Yongge Yang; Chao Ding; Qing Shen
Nanomaterials, 12, 18, 3101-3109, 07 Sep. 2022, Peer-reviwed
Scientific journal, English

Sequential Passivation for Lead-Free Tin Perovskite Solar Cells with High Efficiency
Dr. Zheng Zhang; Dr. Muhammad Akmal Kamarudin; Dr. Ajay; Kumar Baranwal; Dr. Gaurav Kapil; Dr. Shahrir; Razey Sahamir; Dr. Yoshitaka Sanehira; Dr. Mengmeng Chen; Dr. Liang Wang; Prof. Qing Shen; Prof. Shuzi Hayase
Angew. Chem., e202210101, 1-7, 02 Sep. 2022, Peer-reviwed
Scientific journal, English

Efficient Exciton Dislocation and Ultrafast Charge Extraction in CsPbI₃ Perovskite Quantum Dots by Using Fullerene Derivative as Semiconductor Ligand
Yusheng Li; Dandan Wang; Shuzi Hayase; Yongge Yang; Chao Ding; Qing Shen
Nanomaterials, Sep. 2022
Scientific journal

Polar Bear Hair Inspired Supra-Photothermal Promoted Water Splitting
Yuan Cao; Linfeng Gao; Bing Wang; Yingfang Yao; Congping Wu; Qing Shen; Jianyong Feng; Yong Zhou; Zhaosheng Li; Zhigang Zou
ACS Materials Lett., 4, 10, 1912-1920, 01 Sep. 2022, Peer-reviwed
Scientific journal, English

Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells
Muhammad Akmal Kamarudin; Shahrir Razey Sahamir; Kohei Nishimura; Satoshi Iikubo; Kenji Yoshino; Takashi Minemoto; Qing Shen; Shuzi Hayase
ACS Materials Lett., 4, 9, 1855-1862, 24 Aug. 2022, Peer-reviwed
Scientific journal, English

Unveiling the Role of the Metal Oxide/Sn Perovskite Interface Leading to Low Efficiency of Sn-Perovskite Solar Cells but Providing High Thermoelectric Properties
Ajay Kumar Baranwal; Shrikant Saini; Yoshitaka Sanehira; Gaurav Kapil; Muhammad Akmal Kamarudin; Chao Ding; Shahrir Razey Sahamir; Tomohide Yabuki; Satoshi Iikubo; Qing Shen; Koji Miyazaki; Shuzi Hayase
ACS Applied Energy Materials, 5, 8, 9750-9758, 22 Aug. 2022
Scientific journal

Indent-Free Vapor-Assisted Surface Passivation Strategy toward Tin Halide Perovskite Solar Cells
Zheng Zhang; Muhammad Akmal Kamarudin; Ajay Kumar Baranwal; Liang Wang; Gaurav Kapil; Shahrir Razey Sahamir; Yoshitaka Sanehira; Mengmeng Chen; Qing Shen; Shuzi Hayase
ACS Applied Materials and Interfaces, 14, 31, 36200-36208, 10 Aug. 2022
Scientific journal, English

Indent-Free Vapor-Assisted Surface Passivation Strategy toward Tin Halide Perovskite Solar Cells
Zheng Zhang; Muhammad Akmal Kamarudin; Ajay Kumar Baranwal; Liang Wang; Gaurav Kapil; Shahrir Razey Sahamir; Yoshitaka Sanehira; Mengmeng Chen; Qing Shen; Shuzi Hayase
ACS APPLIED MATERIALS & INTERFACES, 14, 31, 36200-36208, Aug. 2022
Scientific journal, English

Enhanced efficiency and stability in Sn-based perovskite solar cells by trimethylsilyl halide surface passivation
Zheng Zhang; Liang Wang; Ajay Kumar Baranwal; Shahrir Razey Sahamir; Gaurav Kapil; Yoshitaka Sanehira; Muhammad Akmal Kamarudin; Kohei Nishimura; Chao Ding; Dong Liu; Yusheng Li; Hua Li; Mengmeng Chen; Qing Shen; Teresa S. Ripolles; Juan Bisquert; Shuzi Hayase
JOURNAL OF ENERGY CHEMISTRY, 71, 604-611, Aug. 2022
Scientific journal, English

Multistrategy Preparation of Efficient and Stable Environment-Friendly Lead-Based Perovskite Solar Cells
Huan Bi; Gaoyi Han; Mengna Guo; Chao Ding; Hanjun Zou; Qing Shen; Shuzi Hayase; Wenjing Hou
ACS Appl. Mater. Interfaces, 14, 31, 35513-35521, 30 Jul. 2022, Peer-reviwed
Scientific journal, English

Over 15% Efficiency PbS Quantum-Dot Solar Cells by Synergistic Effects of Three Interface Engineering: Reducing Nonradiative Recombination and Balancing Charge Carrier Extraction
Chao Ding; Dandan Wang; Dong Liu; Hua Li; Yusheng Li; Shuzi Hayase; Tomah Sogabe; Taizo Masuda; Yong Zhou; Yingfang Yao; Zhigang Zou; Ruixiang Wang; Qing Shen
Adv. Energy Mater., 12, 15, 1-16, 28 Jul. 2022, Peer-reviwed
Scientific journal, English

Unraveling the Organic and Inorganic Passivation Mechanism of ZnO Nanowires for Construction of Efficient Bulk Heterojunction Quantum Dot Solar Cells
Yuyao Wei; Mako Nakamura; Chao Ding; Dong Liu; Hua Li; Yusheng Li; Yongge Yang; Dandan Wang; Ruixiang Wang; Shuzi Hayase; Taizo Masuda; Qing Shen
ACS Appl. Mater. Interfaces, 14, 31, 36268-36276, 27 Jul. 2022, Peer-reviwed
Scientific journal, English

The Effect of PbS Colloidal Quantum Dots with CdS and ZnS Coating on Photovoltaic Properties
Napasuda Wichaiyo; Mettaya Kitiwan; Qing Shen; Witoon Yindeesuk
Current Applied Science and Technology, King Mongkut's Institute of Technology Ladkrabang, 23, 2, 19 Jul. 2022, In this research, we used the co-precipitation method to fabricate lead sulfide colloidal quantum dots (PbS CQDs) for photovoltaic cells. PbS CQDs were deposited uniformly on a titanium dioxide electrode by the dip-coating method. Photoelectrodes were prepared by coating layers using the successive ionic layer adsorption and reaction (SILAR) method. A solar simulation was used to investigate the photovoltaic properties of photoelectrodes under one sun illumination (100 mW/cm2) at room temperature (AM 1.5 G). The photovoltaic measurements demonstrated that TiO2/PbS CQDs with CdS and ZnS coating electrodes had a maximum power conversion efficiency (PCE) of 1.01 %. The crystallite size of PbS CQDs with different coating layers was analyzed using X-ray diffraction (XRD), and the crystallite size range was 6-7 nm. The existence of PbS CQDs and coating layers on the TiO2 electrodes was confirmed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). UV-visible spectroscopy was used to obtain the optical properties of the photoelectrodes. The optical band gap was 0.72-0.75 eV.
Scientific journal

Unraveling the Organic and Inorganic Passivation Mechanism of ZnO Nanowires for Construction of Efficient Bulk Heterojunction Quantum Dot Solar Cells
Yuyao Wei; Mako Nakamura; Chao Ding; Dong Liu; Hua Li; Yusheng Li; Yongge Yang; Dandan Wang; Ruixiang Wang; Shuzi Hayase; Taizo Masuda; Qing Shen
ACS APPLIED MATERIALS & INTERFACES, Jul. 2022
Scientific journal, English

Influence of charge transport layer on the crystallinity and charge extraction of pure tin-based halide perovskite film
Yaohong Zhang; Muhammad Akmal Kamarudin; Qiao Li; Chao Ding; Yong Zhou; Yingfang Yao; Zhigang Zou; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase; Qing Shen
JOURNAL OF ENERGY CHEMISTRY, 69, 612-615, Jun. 2022
Scientific journal, English

Top-Contacts-Interface Engineering for High-Performance Perovskite Solar Cell With Reducing Lead Leakage
Huan Bi; Gaoyi Han; Mengna Guo; Chao Ding; Shuzi Hayase; Hanjun Zou; Qing Shen; Yao Guo; Wenjing Hou
Sol. RRL, 6, 2200352-1, 01 Jun. 2022, Peer-reviwed
Scientific journal, English

Exponential optical absorption edge in PbS quantum dot-ligand systems on single crystal rutile-TiO2 revealed by photoacoustic and absorbance spectroscopies
Taro Toyoda; Qing Shen; Naoki Nakazawa; Yasuha Yoshihara; Keita Kamiyama; Shuzi Hayase
Materials Research Express, IOP Publishing, 9, 2, 1-13, 20 Apr. 2022, Peer-reviwed
Scientific journal, English

Enhancing the Electronic Properties and Stability of High-Efficiency Tin-Lead Mixed Halide Perovskite Solar Cells via Doping Engineering.
Shahrir Razey Sahamir; Muhammad Akmal Kamarudin; Teresa S Ripolles; Ajay Kumar Baranwal; Gaurav Kapil; Qing Shen; Hiroshi Segawa; Juan Bisquert; Shuzi Hayase
The journal of physical chemistry letters, 13, 13, 3130-3137, 07 Apr. 2022, True, Overcoming Voc loss to increase the efficiency of perovskite solar cells (PSCs) has been aggressively studied. In this work, we introduce and compare rubidium iodide (RbI) and potassium iodide (KI) alkali metal halides (AMHs) as dopants in a tin-lead (SnPb)-based perovskite system to improve the performance of PSCs by enhancing their Voc. Improvement in terms of surface morphology, crystallinity, charge transfer, and carrier transport in the SnPb perovskites was observed with the addition of AMH dopants. Significant power conversion efficiency improvement has been achieved with the incorporation of either dopant, and the highest efficiency was 21.04% in SnPb mixed halide PSCs when the RbI dopant was employed. In conclusion, we can outline the enhancement strategy that yields a remarkable efficiency of >20% with a smaller Voc loss and improved storage, light, and thermal stability in SnPb PSCs via doping engineering.
Scientific journal, English

A highly efficient and stable perovskite cathode with in situ exsolved NiFe alloy nanoparticles for CO2 electrolysis
Mengmeng Wang; Naizhi Li; Qing Shen; Zhongliang Zhan; Chusheng Chen
SUSTAINABLE ENERGY & FUELS, 6, 8, 2038-2044, Apr. 2022
Scientific journal, English

Relationship between Carrier Density and Precursor Solution Stirring for Lead-Free Tin Halide Perovskite Solar Cells Performance
Baranwal A. K; Nishimura K; Liu D; Kamarudin M. A; Kapil G; Saini S; Yabuki T; Iikubo S; Minemoto T; Yoshino K; Miyazaki K; Shen Q; Hayase S
ACS Appl. Energy Mater., American Chemical Society, x, 4, 4002-4007, 01 Apr. 2022, Peer-reviwed
Scientific journal, English

Highly efficient and low hysteresis methylammonium-free perovskite solar cells based on multifunctional oteracil potassium interface modification
Huan Bi; Yao Guo; Mengna Guo; Chao Ding; Shuzi Hayase; Tao Mou; Qing Shen; Gaoyi Han; Wenjing Hou
Chemical Engineering Journal, Elsevier B.V., 439, 125671, 09 Mar. 2022, Peer-reviwed
Scientific journal, English

Structural stability and optical properties of tin-based iodide perovskite
de A; Iikubo S; Yamamoto K; Shen Q; Yoshino K; Minemoto T; Hayase S
Japanese Journal of Applied Physics, Japanese Journal of Applied Physics, 61, 3, 03 Mar. 2022, Peer-reviwed
Scientific journal, English

Tin–Lead Perovskite Solar Cells Fabricated on Hole Selective Monolayers
Gaurav Kapil; Takeru Bessho; Yoshitaka Sanehira; Shahrir R. Sahamir; Mengmeng ChenMengmeng Chen; i-Powered Energy; System Research Center (i-PERC; The University of Electro-Communications; Chofugaoka; Chofu, Toky; Japan; More by Mengmeng Chen; Ajay Kumar Baranwal; Dong Liu; Yuya Sono; Daisuke Hirotani; Daishiro Nomura; Kohei Nishimura; Muhammad Akmal Kamarudin; Qing Shen; Hiroshi Segawa; Shuzi Hayase
ACS Energy Lett., American Chemical Society, 7, 3, 966-974, 11 Feb. 2022, Peer-reviwed
Scientific journal, English

High performance wide bandgap Lead-free perovskite solar cells by monolayer engineering
Mengmeng Chen; Gaurav Kapil; Liang Wang; Shahrir Razey Sahamir; Ajay K. Baranwal; Kohei Nishimura; Yoshitaka Sanehira; Zheng Zhang; Muhammad Akmal Kamarudin; Qing Shen; Shuzi Hayase
Chemical Engineering Journal, Elsevier B.V., 436, 135196, 11 Feb. 2022, Peer-reviwed
Scientific journal, English

Large synergy effects of doping, a site substitution, and surface passivation in wide bandgap Pb-free ASnI2Br perovskite solar cells on efficiency and stability enhancement
Mengmeng Chen; Gaurav Kapil; Yusheng Li; Muhammad Akmal Kamarudin; Ajay K. Baranwal; Kohei Nishimura; Shahrir Razey Sahamir; Yoshitaka Sanehira; Hua Li; Chao Ding; Zheng Zhang; Qing Shen; Shuzi Hayase
Journal of Power Sources, 520, 01 Feb. 2022, Peer-reviwed
Scientific journal, English

Influence of charge transport layer on the crystallinity and charge extraction of pure tin-based halide perovskite film
Yaohong Zhang; Muhammad Akmal Kamarudin; Qiao Li; Chao Ding; Yong Zhou; Yingfang Yao; Zhigang Zou; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase; Qing Shen
Journal of Energy Chemistry, Elsevier B.V., 69, 612-615, 15 Jan. 2022, Peer-reviwed
Scientific journal, English

Molybdenum Sulfide Quantum Dots Decorated on TiO2 for Photocatalytic Hydrogen Evolution
Tianyang Qiu; Lu Wang; Boye Zhou; Yanjun Zhu; Chen Zhuang; Qi Liu; Qing Shen; Yujie Xiong; Yong Zhou; Zhigang Zou
ACS Appl. Nano Mater., ACS Appl. Nano Mater., 5, 1, 702-709, 28 Dec. 2021, Peer-reviwed
Scientific journal, English

Bismuth Vacancy-Induced Efficient CO2 Photoreduction in BiOCl Directly from Natural Air: A Progressive Step toward Photosynthesis in Nature
Wang L; Wang R; Qiu T; Yang L; Han Q; Shen Q; Zhou X; Zhou Y; Zou Z
Nano Lett., American Chemical Society, 21, 24, 10260-10266, 12 Nov. 2021, Peer-reviwed
Scientific journal, English

Large Grain Growth and Energy Alignment Optimization by Diethylammonium Iodide Substitution at A Site in Lead-Free Tin Halide Perovskite Solar Cells
Zheng Zhang; Ajay Kumar Baranwal; Shahrir Razey Sahamir; Gaurav Kapil; Yoshitaka Sanehira; Mengmeng Chen; Kohei Nishimura; Chao Ding; Dong Liu; Hua Li; Yusheng Li; Muhammad Akmal Kamarudin; Qing Shen; Teresa S. Ripolles; Juan Bisquert; Shuzi Hayase
SOLAR RRL, 5, 11, Nov. 2021
Scientific journal, English

Preparation of nanocomposites of PbS quantum dots dispersed in MAPbI3matrix from precursor solution of Pb xanthate
Daisuke Hirotani; Kohei Nishimura; Yaohong Zhang; Qing Shen; Shuzi Hayase
Advances in Natural Sciences: Nanoscience and Nanotechnology, IOP Publishing Ltd, 12, 3, 01 Sep. 2021
Scientific journal, English

Electrocatalytic fixation of N2into NO3-: Electron transfer between oxygen vacancies and loaded Au in Nb2O5-: Xnanobelts to promote ambient nitrogen oxidation
Yintong Zhang; Feng Du; Ruyi Wang; Xintong Ling; Xiaoyong Wang; Qing Shen; Yujie Xiong; Tao Li; Yong Zhou; Zhigang Zou
Journal of Materials Chemistry A, Royal Society of Chemistry, 9, 32, 17442-17450, 28 Aug. 2021
Scientific journal, English

Hollow InVO4 Nanocuboid Assemblies toward Promoting Photocatalytic N2 Conversion Performance
Qiutong Han; Xiaowan Bai; Jingming Chen; Shengnan Feng; Wa Gao; Wenguang Tu; Xiaoyong Wang; Jinlan Wang; Bi Jia; Qing Shen; Yong Zhou; Zhigang Zou
Advanced Materials, 33, 2006780, 1-9, 15 Aug. 2021, Peer-reviwed
Scientific journal, English

Colloidal quantum-dot bulk-heterojunction solar cells
Chao Ding; Lixiu Zhang; Qing Shen; Liming Ding
Journal of Semiconductors, 42, 11, 110203-110206, 09 Aug. 2021, Peer-reviwed
Scientific journal, English

Matrix Manipulation of Directly-Synthesized PbS Quantum Dot Inks Enabled by Coordination Engineering
Li, F; Liu, Y; Shi, G; Chen, W; Guo, R; Liu, D; Zhang, Y; Wang, Y; Meng, X; Zhang, X; Lv, Y; Deng, W; Zhang, Q; Shi, Y; Chen, Y; Wang, K; Shen, Q; Liu, Z; Müller-Buschbaum, P; Ma, W
Adv. Funct. Mater., John Wiley & Sons, Inc., 31, 2104457, 06 Aug. 2021, Peer-reviwed
Scientific journal, English

Matrix Manipulation of Directly-Synthesized PbS Quantum Dot Inks Enabled by Coordination Engineering
Fei Li; Yang Liu; Guozheng Shi; Wei Chen; Renjun Guo; Dong Liu; Yaohong Zhang; Yongjie Wang; Xing Meng; Xuliang Zhang; You Lv; Wei Deng; Qing Zhang; Yao Shi; Yifan Chen; Kai Wang; Qing Shen; Zeke Liu; Peter Müller-Buschbaum; Wanli Ma
Advanced Functional Materials, 2021, 2104457, 1-9, 06 Aug. 2021, Peer-reviwed
Scientific journal, English

acancy-defect modulated pathway of photoreduction of co2 on single atomically thin aginp2s6 sheets into olefiant gas.
Gao W; Li S; He H; Li X; Cheng Z; Yang Y; Wang J; Shen Q; Wang X; Xiong Y; Zhou Y; Zou Z
Nat Commun, 12, 4747, 1-8, 06 Aug. 2021, Peer-reviwed
Scientific journal, English

The effect of water on colloidal quantum dot solar cells
Guozheng Shi; Chen Cheng; Tianshu Zhai; Botong Chen; Xinnan Mao; Yang Liu; Xuliang Zhang; Xufeng Ling; Yannan Zhang; Xing Meng; Yifan Chen; Steffen Duhm; Liang Zhang; Lu Wang; Shiyun Xiong; Zeke Liu; Wanli Ma
Nature Communications, 12, 4381, 1-12, 19 Jul. 2021, Peer-reviwed
Scientific journal, English

Erratum: Bimetallic oxyhydroxidein situderived from an Fe2Co-MOF for efficient electrocatalytic oxygen evolution (J. Mater. Chem. A (2021) 9 (13271-13278) DOI: 10.1039/D1TA02159A)
Xintong Ling; Feng Du; Yintong Zhang; Yan Shen; Wa Gao; Bo Zhou; Zhiyuan Wang; Guoling Li; Tao Li; Qing Shen; Yujie Xiong; Xiaoyong Wang; Yong Zhou; Zhigang Zou
Journal of Materials Chemistry A, Royal Society of Chemistry, 9, 25, 14607, 07 Jul. 2021
Scientific journal, English

Analysis of ion implanted diamond-like-carbon films using laser-induced transient reflecting grating technique
Q. Shen; A. Harata; T. Sawada
Journal De Physique. IV : JP, 4, 7, Jul. 2021
Scientific journal

Bimetallic oxyhydroxidein situderived from an Fe2Co-MOF for efficient electrocatalytic oxygen evolution
Xintong Ling; Feng Du; Yintong Zhang; Yan Shen; Wa Gao; Bo Zhou; Zhiyuan Wang; Guoling Li; Tao Li; Qing Shen; Yujie Xiong; Xiaoyong Wang; Yong Zhou; Zhigang Zou
Journal of Materials Chemistry A, Royal Society of Chemistry, 9, 22, 13271-13278, 14 Jun. 2021
Scientific journal, English

High-Efficiency Lead-Free Wide Band Gap Perovskite Solar Cells via Guanidinium Bromide Incorporation
Mengmeng Chen; Muhammad Akmal Kamarudin; Ajay K. Baranwal; Gaurav Kapil; Teresa S. Ripolles; Kohei Nishimura; Daisuke Hirotani; Shahrir Razey Sahamir; Zheng Zhang; Chao Ding; Yoshitaka Sanehira; Juan Bisquert; Qing Shen; Shuzi Hayase
ACS Applied Energy Materials, 4, 6, 5615-5624, 08 Jun. 2021, Peer-reviwed
Scientific journal, English

Passivating Quantum Dot Carrier Transport Layer with Metal Salts
Zihan Chen; Yaohong Zhang; Zhi Li Teh; Jianfeng Yang; Lin Yuan; Gavin J. Conibeer; Robert J. Patterson; Qing Shen; Shujuan Huang; Zhilong Zhang
ACS Applied Materials & Interfaces, 13, 24, 28679-28688, 08 Jun. 2021, Peer-reviwed
Scientific journal, English

Tin-Lead Perovskite Fabricated via Ethylenediamine Interlayer Guides to the Solar Cell Efficiency of 21.74%
Gaurav Kapil; Takeru Bessho; Takatoshi Maekawa; Ajay Kumar Baranwal; Yaohong Zhang,Muhammad Akmal Kamarudin; Daisuke Hirotani; Qing Shen; Hiroshi Segawa; Shuzi Hayase
Advanced Energy Materials, 11, 2101069, 1-9, 28 May 2021, Peer-reviwed
Scientific journal, English

Ultra-Halide-Rich Synthesis of Stable Pure Tin-Based Halide Perovskite Quantum Dots: Implications for Photovoltaics
Feng Liu; Junke Jiang; Taro Toyoda; Muhammad Akmal Kamarudin; Shuzi Hayase; Ruixiang Wang; Shuxia Tao; Qing Shen
ACS Appl. Nano Mater., 1-11, 30 Mar. 2021, Peer-reviwed
Scientific journal, English

Elegant Construction of ZnIn2S4/BiVO4 Hierarchical Heterostructures as Direct Z-Scheme Photocatalysts for Efficient CO2 Photoreduction
Qiutong Han; Liang Li; Wa Gao; Yan Shen; Lu Wang; Yintong Zhang; Xiaoyong Wang; Qing Shen; Yujie Xiong; Yong Zhou; Zhigang Zou
ACS Appl. Mater. Interfaces, 13, 13, 15092-15100, 24 Mar. 2021, Peer-reviwed
Scientific journal, English

The role of sodium in stabilizing tin–lead (Sn–Pb) alloyed perovskite quantum dots
Junke Jiang; Feng Liu; Qing Shen; Shuxia Tao
Journal of Materials Chemistry A, The Royal Society of Chemistry 2021, 19 Mar. 2021, Peer-reviwed
Scientific journal, English

Impact of Auger recombination on performance limitation of perovskite solar cell
JakapanChantana; YuKawano; TakahitoNishimur; AbdurashidMavlonov; QingShen; KenjiYoshino; SatoshiIikubo; ShuziHayase; TakashiMinemoto
Solar Energy, Elsevier Ltd, 217, 342-353, 15 Mar. 2021, Peer-reviwed
Scientific journal, English

Study of open circuit voltage loss mechanism in perovskite solar cells
Yulu He; Imane Abdellaoui; M. Abdel-Shakour; Towhi; Hossain Chowdhury; Muhammad Akmal Kamarudin; Ana Flávia Nogueira; Qing Shen; Shuzi Hayase; Ashraful Islam; Takeaki Sakurai
Japanese Journal of Applied Physics, 60, SBBF13, 1-6, 26 Feb. 2021, Peer-reviwed
Scientific journal, English

Relationship between perovsktie solar cell efficiency and lattice disordering
Daisuke Hirotani; Kohei Nishimura; Kengo Hamada; Muhammad Akmal Kamarudin; Satoshi Iikubo; Qing Shen; Taro Toyoda; Shuzi Hayase
Japanese Journal of Applied Physics, IOP Publishing, 60, 3, 035001-035001, 15 Feb. 2021, Abstract

Multi-cations lead perovskite solar cells have shown higher performance than single-cation perovskite solar cells. This compositional engineering of perovskite material retains the optimum tolerance factor while allowing the tuning of the band gap in addition to the enhanced stability of cubic phase perovskite. However, no in-depth explanation has been provided on the relationship between crystal structure of the perovskite and the solar cell efficiency. In this report, we investigate the effect of lattice disordering of FA_xMA_1−xPbI₃ perovskite on the tolerance factor and solar cell efficiency. The lattice disordering estimated using Williamson–Hall plot of XRD analysis revealed that the disordering is lowest when x = 0.2 and highest when x = 1.0. Correspondingly, x = 0.2 showed the highest solar cell performance and long carrier lifetime Our results show that the disordering in α phase of FA_xMA_1−xPbI₃ layer causes lattice deformation which affects the carrier lifetime and solar cell efficiency, instead of the defects on constituent elements.
Scientific journal

Modeling of Nucleation and Growth in the Synthesis of PbS Colloidal Quantum Dots Under Variable Temperatures
Dandan Wang; Meibo Xing; Yuyao Wei; Longxiang Wang; Ruixiang Wang; Qing Shen
ACS Omega, American Chemical Society, 6, 5, 3701-3710, 29 Jan. 2021, Peer-reviwed
Scientific journal, English

Mg-doped ZnO layer to enhance electron transporting for PbS quantum dot solar cells
Meibo Xing; Yuyao Wei; Dandan Wang; Qing Shen; Ruixiang Wang
CURRENT APPLIED PHYSICS, 21, 14-19, Jan. 2021
Scientific journal, English

Photoexcited carrier dynamics in colloidal quantum dot solar cells: insights into individual quantum dots, quantum dot solid films and devices
Zhang, Y; Wu, G; Liu, F; Ding, C; Zou, Z; Shen, Q
Chemical Society Reviews, 49, 1, 49-84, 11 Dec. 2020, Peer-reviwed
Scientific journal, English

Atomistic and Electronic Origin of Phase Instability of Metal Halide Perovskites
Junke Jiang; Feng Liu; Ionut Tranca; Qing Shen; Shuxia Tao
ACS Applied Energy Materials, 2020 American Chemical Society, 3, 12, 11548-11558, 22 Nov. 2020, Peer-reviwed
Scientific journal, English

Passivation Strategy of Reducing Both Electron and Hole Trap States for Achieving High-Efficiency PbS Quantum-Dot Solar Cells with Power Conversion Efficiency over 12%
Chao Ding; Feng Liu; Yaohong Zhang; Shuzi Hayase; Taizo Masuda; Ruixiang Wang; Yong Zhou; Yingfang Yao; Zhigang Zou; Qing Shen
ACS Energy Letters, ACS Publications, 5, 10, 3224-3236, 18 Sep. 2020, Peer-reviwed
Scientific journal, English

Inverted CsPbI2Br perovskite solar cells with enhanced efficiency and stability in ambient atmosphere via formamidinium incorporation, Solar Energy Materials and Solar Cells
Mengmeng Chen; Shahrir R. Sahamir; Gaurav Kapil; Ajay K. Baranwal; Muhammad Akmal Kamarudin; Yaohong Zhang; Kohei Nishimura; Chao Ding; Dong Liu; Daisuke Hirotani; Qing Shen; Shuzi Hayase
Solar Energy Materials and Solar Cells, Elsevier, 218, 110741-110749, 06 Sep. 2020, Peer-reviwed
Scientific journal, English

A New Strategy for Increasing the Efficiency of Inverted Perovskite Solar Cells to More than 21%: High-Humidity Induced Self-Passivation of Perovskite Films
Fan Zhang; Qingxun Huang; Jun Song; Shuzi Hayase; Junle Qu; Qing Shen
SOLAR RRL, 4, 9, Sep. 2020
Scientific journal, English

Dependence of the optical properties and carrier dynamics of CsSn_xPb_1-xBr₃ Perovskite nanocrytal on the ratio of tin to lead
Kawabata Kentaro; Liu Feng; Zhang Yaohong; Shen Qing; Toyoda Taro; Hayase Shuzi
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.2, 1937-1937, 26 Aug. 2020
Japanese

Relationship between Built-in Potential and Open-circuit Voltage in Tin-based Perovskite Solar Cells
Hirotani Daisuke; Kamarudin Akmal; Nishimura Kohei; Qing Shen; Taro Toyoda; Hayase Shuzi
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.2, 1650-1650, 26 Aug. 2020
Japanese

Efficiency improvement of Sn-perovskite solar cells by A-site multicationization
Nishimura Kohei; Akmal Kamarudin Muhammad; Hirotani Daisuke; Hamada Kengo; Iikubo Satoshi; Shen Qing; Minemoto Takashi; Yoshino Kenji; Hayase Shuzi
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.2, 1653-1653, 26 Aug. 2020
Japanese

Stability Improvement of Perovskite Solar Cells by Adding Sb‐Xanthate to Precursor Solution
Kyung-Su Nam; Suvratha Krishnamurthy; Shen Qing; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Tingli Ma; Shyam Pandey; Shuzi Hayase
Phys. Status Solidi A, John Wiley & Sons, Inc, 217, 18, 2000144 -1-2000144 -5, 08 Jul. 2020, Peer-reviwed
Scientific journal, English

Synthesis of Pb-doped CdS quantum dot using SILAR method on mesoporous TiO2 layer
Yosita Sudswasd; Feng Liu; Taro Toyoda; Qing Shen; Witoon Yindeesuk
Journal of Physics: Conference Series, 1719, 012063, 05 Jul. 2020, Peer-reviwed
Scientific journal, English

In-Depth Exploration of the Charge Dynamics in Surface-Passivated ZnO Nanowires
Yaohong Zhang; Shuhei Ozu; Guohua Wu; Chao Ding; Feng Liu; Dong Liu; Takashi Minemoto; Taizo Masuda; Shuzi Hayase; Taro Toyoda; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY C, 124, 29, 15812-15817, Jul. 2020
Scientific journal, English

In-Depth Exploration of the Charge Dynamics in Surface-Passivated ZnO Nanowires
Yaohong Zhang; Shuhei Ozu; Guohua Wu; Chao Ding; Feng Liu; Dong Liu; Takashi Minemoto; Taizo Masuda; Shuzi Hayase; Taro Toyoda; Qing Shen
The Journal of Physical Chemistry C, ACS Publications, 124, 29, 15812-15817, 26 Jun. 2020, Peer-reviwed
Scientific journal, English

All-inorganic cesium lead halide perovskite nanocrystals for solar-pumped laser application
T. Masuda; Y. Zhang; C. Ding; F. Liu; K. Sasaki; Q. Shen; M. Endo
Journal of Applied Physics, AIP Publishing, 127, 243104, 1-9, 24 Jun. 2020, Peer-reviwed
Scientific journal, English

Exquisite Design of Porous Carbon Microtubule-Scaffolding Hierarchical In2O3-ZnIn2S4 Heterostructures toward Efficiently Photocatalytic Conversion of CO2 into CO
Wa Gao; Lu Wang; Chao Gao; Jinqiu Liu; Yong Yang; Liuqing Yang; Qing; Shen, Congping Wu; Yong Zhou; Zhigang Zou
Nanoscale, Royal Society of Chemistry, 12, 14676-14681, 17 Jun. 2020, Peer-reviwed
Scientific journal, English

Pb free perovskite solar cells with over 13 % efficiency-Direction to high efficiency-Pb free solar cells
Kohei Nishimura; Muhammad Akmal Kamarudin; Daisuke Hirotani; Shen Qing; Takashi Minemoto; Satoshi Iikubo; Kengo Yoshino; Shuzi Hayase
Conference Record of the IEEE Photovoltaic Specialists Conference, Institute of Electrical and Electronics Engineers Inc., 2020-, 0661-0663, 14 Jun. 2020
International conference proceedings, English

The effect of p/n junction position on perovskite solar cell efficiency by changing polarity of the perovskite layer
Daisuke Hirotani; Yuta Maeda; Muhammad Akmal Kamarudin; Shen Qing; Taro Toyoda; Shuzi Hayase
Japan Society of Applied Physics, IOP SCIENCE, 59, 6, 061005-1-061005-7, 01 Jun. 2020, Peer-reviwed
Scientific journal, English

In situ preparation of Bi2S3 nanoribbon-anchored BiVO4 nanoscroll heterostructures for the catalysis of Cr(vi) photoreduction
Jianqiang Hu; Fen Zhang; Yong Yang; Qiutong Han; Zhaosheng Li; Qing Shen; Yongcai Zhang; Yong Zhou; Zhigang Zou
Catalysis Science & Technology, Royal Society of Chemistry, 10, 3843-3847, 25 May 2020, Peer-reviwed, Novel BiVO4/Bi2S3 heterostructures were fabricated simply by growing Bi2S3 nanoribbons on the surface of BiVO4 nanoscrolls, in situ, using pre-synthesized BiVO4 and bismuth(III) dimethyldithiocarbamate (Bi(dedc)3) as precursors. The length and density of the anchored Bi2S3 nanoribbons were controlled by tuning the amount of Bi(dedc)3 reacted with BiVO4 nanoscrolls. Compared to pure BiVO4, the prepared BiVO4/Bi2S3 heterostructures showed enhanced photocatalytic activity for Cr(VI) reduction under UV-visible light illumination, mainly due to the extended range of visible light absorption and the improved separation efficiency of photoinduced electrons and holes.
Scientific journal, English

Artificial Trees for Artificial Photosynthesis: Construction of Dendrite-Structured α-Fe2O3/g-C3N4 Z-Scheme System for Efficient CO2 Reduction into Solar Fuels
Yan Shen; Qiutong Han; Jianqiang Hu; Wa Gao; Lu Wang; Liuqing Yang; Chao Gao; Qing Shen; Congping Wu; Xiaoyong Wang; Xin Zhou; Yong Zhou; Zhigang Zou
ACS Applied Energy Materials, ACS Publications, 3, 7, 6561-6572, 20 May 2020, Peer-reviwed, A direct all-solid-state Z-scheme heterojunction photocatalyst of a g-C3N4-coated tree-like α-Fe2O3 was rationally constructed toward CO2 conversion. The so-called artificial tree shows excellent performance and stability for CO production (17.8 μmol g–1 h–1), almost 3 times that of pristine g-C3N4. Density functional theory computations explain the intrinsic cause for the formation of the Z-scheme structure. The enhanced photocatalytic performance can be attributed to a synergistic effect of the following factors: (1) the combination of α-Fe2O3 with g-C3N4 helps to promote light harvesting and CO2 adsorption; (2) the hybridization effectively enhances the spatial separation of photogenerated electrons and holes, suppressing the undesirable recombination of charge carriers; (3) the dendritic structure of α-Fe2O3 provides ample active sites with considerable steps, edges, and kinks along the twigs, and meanwhile, the exposed (001) facet with high electron conduction facilitates photoelectrons’ transportation to the interface. This work provides new insight into constructing Z-scheme photocatalysts for CO2 conversion.
Scientific journal, English

Surface-Modified Graphene Oxide/Lead Sulfide Hybrid Film-Forming Ink for High-Efficiency Bulk Nano-Heterojunction Colloidal Quantum Dot Solar Cells
Yaohong Zhang; Guohua Wu; Chao Ding; Feng Liu; Dong Liu; Taizo Masuda; Kenji Yoshino; Shuzi Hayase; Ruixiang Wang; Qing Shen
Nano-Micro Letters, Springer Nature, 12, 111, 1-14, 16 May 2020, Peer-reviwed, True, Solution-processed colloidal quantum dot solar cells (CQDSCs) is a promising candidate for new generation solar cells. To obtain stable and high performance lead sulfide (PbS)-based CQDSCs, high carrier mobility and low non-radiative recombination center density in the PbS CQDs active layer are required. In order to effectively improve the carrier mobility in PbS CQDs layer of CQDSCs, butylamine (BTA)-modified graphene oxide (BTA@GO) is first utilized in PbS-PbX2 (X = I-, Br-) CQDs ink to deposit the active layer of CQDSCs through one-step spin-coating method. Such surface treatment of GO dramatically upholds the intrinsic superior hole transfer peculiarity of GO and attenuates the hydrophilicity of GO in order to allow for its good dispersibility in ink solvent. The introduction of BTA@GO in CQDs layer can build up a bulk nano-heterojunction architecture, which provides a smooth charge carrier transport channel in turn improves the carrier mobility and conductivity, extends the carriers lifetime and reduces the trap density of PbS-PbX2 CQDs film. Finally, the BTA@GO/PbS-PbX2 hybrid CQDs film-based relatively large-area (0.35 cm2) CQDSCs shows a champion power conversion efficiency of 11.7% which is increased by 23.1% compared with the control device.
Scientific journal, English

Surface-Modified Graphene Oxide/Lead Sulfide Hybrid Film-Forming Ink for High-Efficiency Bulk Nano-Heterojunction Colloidal Quantum Dot Solar Cells
Yaohong Zhang; Guohua Wu; Chao Ding; Feng Liu; Dong Liu; Taizo Masuda; Kenji Yoshino; Shuzi Hayase; Ruixiang Wang; Qing Shen
NANO-MICRO LETTERS, 12, 1, May 2020
Scientific journal, English

Lead-free tin-halide perovskite solar cells with 13% efficiency
Kohei Nishimura; Muhammad Akmal Kamarudin; Daisuke Hirotani; Kengo Hamada; Qing Shen; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase
Nano Energy, Elsevier Ltd., 74, 104858, 1-10, 28 Apr. 2020, Peer-reviwed, Despite the similarities of the optoelectronic properties between tin halide and lead halide perovskites, the performance of tin perovskite solar cells (PSCs) is still far below that of lead PSCs with highest reported efficiency to date of around 10%. This is due to the chemical instability of tin halide perovskite crystals and the energy band levels mismatch between the perovskite and charge transport layers. In this work, tin halide PSCs with efficiency of more than 13% has been fabricated by regulating the A site cation to achieve a tolerance factor of nearly 1. The partial substitution of formamidinium cation with ethylammonium cation affords a more stable tin perovskite crystal and at the same time suppresses the trap density by as much as 1 order of magnitude. Furthermore, the more favourable energy levels of the EA-substituted tin perovskites enhanced the charge extraction process into the charge transport layers and thus reducing the charge carrier recombination. This work provides a proof that tin-halide PSCs has the potential to compete with more toxic lead-based PSCs, and hopefully will pave the future direction for fabricating more efficient and stable lead-free PSCs.
Scientific journal, English

A New Strategy for Increasing the Efficiency of Inverted Perovskite Solar Cells to More than 21%: High‐Humidity Induced Self‐Passivation of Perovskite Films
Fan Zhang; Qingxun Huang; Jun Song; Shuzi Hayase; Junle Qu; Qing Shen
Solar RRL, 4, 9, 2000149-2000158, 15 Apr. 2020, Peer-reviwed
Scientific journal, English

Improvement of conversion efficiency of SnGe-perovskite solar cell by ethylammonium substitution
Nishimura Kohei; Muhammad Akmal Kamarudin; Hirotani Daisuke; Hamada Kengo; Iikubo Satoshi; Shen Qing; Minemoto Takashi; Yoshino Kenji; Hayase Shuzi
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.1, 2403-2403, 28 Feb. 2020
Japanese

Optical absorption of PbS quantum dots with ligands on single crystal TiO₂ - Comparative study of photoaocoustic and absorbance spectroscopies -
Toyoda Taro; Shen Qing; Nakazawa Naoki; Yoshihara Yasuha; Kamiyama Keita; Hayase Shuzi
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.1, 2400-2400, 28 Feb. 2020
Japanese

Photoexcited carrier dynamics of PbS/CdS core-shell quantum dots
Oguri Naoki; Ding Chao; Yoshida Koji; Zhang Yaohong; Hayase Shuzi; Toyoda Taro; Shen Qing
JSAP Annual Meetings Extended Abstracts, The Japan Society of Applied Physics, 2020.1, 2879-2879, 28 Feb. 2020
Japanese

Reducing trap density and carrier concentration by a Ge additive for an efficient quasi 2D/3D perovskite solar cell
Chi Huey Ng; Kengo Hamada; Gaurav Kapil; Muhammad Akmal Kamarudin; Zhen Wang; Satoshi Likubo; Qing Shen; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Journal of Materials Chemistry A, 8, 6, 2962-2968, 14 Feb. 2020, Peer-reviwed
Scientific journal

Growth of Amorphous Passivation Layer Using Phenethylammonium Iodide for High-Performance Inverted Perovskite Solar Cells
Fan Zhang; Qinxun Huang; Jun Song; Yaohong Zhang; Chao Ding; Feng Liu; Dong Liu; Xiaobin Li; Hironobu Yasuda; Koji Yoshida; Junle Qu; Shuzi Hayase; Taro Toyoda; Takashi Minemoto; Qing Shen
SOLAR RRL, 4, 2, Feb. 2020
Scientific journal, English

Temperature dependent photovoltaic performance of TiO2/PbS heterojunction quantum dot solar cells
Meibo Xing; Yaohong Zhang; Qing Shen; Ruixiang Wang
SOLAR ENERGY, 195, 1-5, Jan. 2020
Scientific journal, English

Photoexcited hot and cold electron and hole dynamics at FAPbI3 perovskite quantum dots/metal oxide heterojunctions used for stable perovskite quantum dot solar cells
Ding, C; Liu, F; Zhang, Y; Hirotani, D; Rin, X; Hayase, S; Minemoto, T; Masuda, T; Wang, R; Shen, Q
Nano Energy, Elsevier, 67, 104267, 2020, Peer-reviwed
Scientific journal, English

Temperature dependent photovoltaic performance of TiO2/PbS heterojunction quantum dot solar cells
Xing, M; Zhang, Y; Shen, Q; Wang, R
Solar Energy, Elsevier, 195, 1-5, 2020, Peer-reviwed
Scientific journal, English

Boosting Photocatalytic CO2 Reduction on CsPbBr3 Perovskite Nanocrystals by Immobilizing Metal Complexes
Zhoujie Chen; Yangguang Hu; Jin Wang; Qing Shen; Yaohong Zhang; Chao Ding; Yu Bai; Guocan Jiang; Zhengquan Li; Nikolai Gaponik
Chem. Mater., ACS, 2020, Peer-reviwed
Scientific journal, English

Trioctylphosphine Oxide Acts as Alkahest for SnX2/PbX2: A General Synthetic Route to Perovskite ASnxPb1-xX3 (A= Cs, FA, MA; X= Cl, Br, I) Quantum Dots
Feng Liu; Yaohong Zhang; Chao Ding; Kentaro Kawabata; Yasuha Yoshihara; Taro Toyoda; Shuzi Hayase; Takashi Minemoto; Ruixiang Wang; Qing Shen
Chem. Mater., ACS, 32, 3, 1089-1100, 2020, Peer-reviwed
Scientific journal, English

Boosting Photocatalytic CO2 Reduction on CsPbBr3 Perovskite Nanocrystals by Immobilizing Metal Complexes
Zhoujie Chen; Yangguang Hu; Jin Wang; Qing Shen; Yaohong Zhang; Chao Ding; Yu Bai; Guocan Jiang; Zhengquan Li; Nikolai Gaponik
Chemistry of Materials, ACS, 32, 4, 1517-1525, 2020, Peer-reviwed
Scientific journal, English

Theoretical analysis of band alignment at back junction in Sn–Ge perovskite solar cells with inverted pin structure
Takashi Minemoto; Yu Kawano; Takahito Nishimura; Qing Shen; Kenji Yoshino; Satoshi Iikubo; Shuzi Hayase; Jakapan Chantana
Solar Energy Materials and Solar Cells, Elsvier, 206, 110268, 2020, Peer-reviwed
Scientific journal, English

Near-Infrared Emission from Tin–Lead (Sn–Pb) Alloyed Perovskite Quantum Dots by Sodium Doping
Feng Liu; Junke Jiang; Yaohong Zhang; Chao Ding; Taro Toyoda; Shuzi Hayase; Ruixiang Wang; Shuxia Tao; Qing Shen
Angewandte Chemie., 59, 22, 8421-8424, 2020, Peer-reviwed, True, Phase-stable CsSnx Pb1-x I3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by the severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of approximately 0.3 %. The ultra-low sodium (Na) doping presented herein is found to be effective in improving PL QYs of these alloyed QDs without alerting their favourable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to around 28 %, almost two orders of magnitude enhancement compared with the pristine one.
Scientific journal, English

Super stable CsPbBr3@SiO2 tumor imaging reagent by stress-response encapsulation
Wentao Song; Yiming Wang; Bing Wang; Yingfang Yao; Wenguang Wang; Jinhui Wu; Qing Shen; Wenjun Luo; Zhigang Zou
Nano Research, 1-7, 2020, Peer-reviwed
Scientific journal, English

Enhanced device performance with passivation of the TiO2 surface using a carboxylic acid fullerene monolayer for a SnPb perovskite solar cell with a normal planar structure
Kengo Hamada; Ryo Tanaka; Muhammad Akmal Kamarudin; Qing Shen; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Taro Toyoda; Tingli Ma; Dong-won Kang; Shuzi Hayase
ACS Appl. Mater. Interfaces, 12, 15, 17776-17782, 2020, Peer-reviwed, True, Research on tin-lead (SnPb) perovskite solar cells (PSCs) has gained popularity in recent years because of their low band gap, which could be applied to tandem solar cells. However, most of the work is based on inverted PSCs using PEDOT:PSS as the hole-transport layer as normal-structure PSCs show lower efficiency. In this work, the reason behind the low efficiency of normal-structure SnPb PSCs is elucidated and surface passivation has been tested as a method to overcome the problem. In the case of normal PSCs, at the interface between the titania layer and SnPb perovskite, there are many carrier traps observed originating from Ti-O-Sn bonds. In order to avoid the direct contact between titania and the SnPb perovskite layer, the titania surface is passivated with carboxylic acid C60 resulting in an efficiency increase from 5.14 to 7.91%. This will provide a direction of enhancing the efficiency of the normal-structure SnPb PSCs through heterojunction engineering.
Scientific journal, English

Thiourea-assisted coating of dispersed copper electrocatalysts on Si photocathodes for solar hydrogen production
Pin Wang; Ziyu Yin; Linfeng Gao; Hui Li; Tongyu Zhang; Qing Shen; Jun Lv; Yingfang Yao; Wenjun Luo; Zhigang Zou
Journal of Energy Chemistry, 40, 75-80, Jan. 2020, Peer-reviwed
Scientific journal, English

Lead-free tin halide perovskite solar cells beyond 10 % efficiency
Muhammad Akmal Kamarudin; Daisuke Hirotani; Zhen Wang; Kengo Hamada; Kohei Nishimura; Qing Shen; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase
Proceedings of the 4th Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics, Fundació Scito, 14 Oct. 2019
International conference proceedings

Suppression of Charge Carrier Recombination in Lead-Free Tin Halide Perovskite via Lewis Base Post-treatment
Muhammad Akmal Kamarudin; Daisuke Hirotani; Zhen Wang; Kengo Hamada; Kohei Nishimura; Qing Shen; Taro Toyoda; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase
The Journal of Physical Chemistry Letters, American Chemical Society ({ACS}), 10, 17, 5277-5283, 05 Sep. 2019, Peer-reviwed
Scientific journal, English

Relationship between Lattice Strain and Efficiency for Sn-Perovskite Solar Cells
Kohei Nishimura; Daisuke Hirotani; Muhammad Akmal Kamarudin; Qing Shen; Taro Toyoda; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase
ACS Applied Materials & Interfaces, American Chemical Society ({ACS}), 11, 34, 31105-31110, 28 Aug. 2019, Peer-reviwed
Scientific journal, English

Strain Relaxation and Light Management in Tin–Lead Perovskite Solar Cells to Achieve High Efficiencies
Gaurav Kapil; Takeru Bessho; Chi Huey Ng; Kengo Hamada; Manish Pandey; Muhammad Akmal Kamarudin; Daisuke Hirotani; Takumi Kinoshita; Takashi Minemoto; Qing Shen; Taro Toyoda; Takurou N. Murakami; Hiroshi Segawa; Shuzi Hayase
ACS Energy Letters, American Chemical Society ({ACS}), 4, 8, 1991-1998, 09 Aug. 2019, Peer-reviwed
Scientific journal, English

Growth of Amorphous Passivation Layer Using Phenethylammonium Iodide for High‐Performance Inverted Perovskite Solar Cells
Zhang, F; Huang, Q; Song, J; Zhang, Y; Ding, C; Liu, F; Liu, D; Li, X; Yasuda, H; Yoshida, K; Qu, J; Hayase, S; Toyoda, T; Minemoto, T; Shen, Q
Sol. RRL, 4, 2, 1900243, 02 Jul. 2019, Peer-reviwed
Scientific journal, English

Growth of Amorphous Passivation Layer Using Phenethylammonium Iodide for High‐Performance Inverted Perovskite Solar Cells
Zhang, F; Huang, Q; Song, J; Zhang, Y; Ding, C; Liu, F; Liu, D; Li, X; Yasuda, H; Yoshida, K; Qu, J; Hayase, S; Toyoda, T; Minemoto, T; Shen, Q
Sol. RRL. doi:10.1002/solr.201900243, 3, 5, 1900243-1-1900243-8, 02 Jul. 2019, Peer-reviwed
Scientific journal, English

Prussian blue analogue-derived Ni and Co bimetallic oxide nanoplate arrays block-built from porous and hollow nanocubes for the efficient oxygen evolution reaction
Shen, Y; Guo, S.-G; Du, F; Yuan, X.-B; Zhang, Y; Hu, J; Shen, Q; Luo, W; Alsaedi, A; Hayat, T; Wen, G; Li, G.-L; Zhou, Y; Zou, Z
Nanoscale, Royal Society of Chemistry, 11, 11765-11773, 01 Jun. 2019, Peer-reviwed
Scientific journal, English

Template deposition of Sb2S3 for solid-state sensitized solar cells
Yafeng Xu; Wenyong Chen; Linhua Hu; Xu Pan; Shangfeng Yang; Qing Shen; Jun Zhu
Journal of Alloys and Compounds, Elsevier, 784, 947-953, 05 May 2019, Peer-reviwed
Scientific journal, English

BiVO4 tubular structures: oxygen defect-rich and largely exposed reactive {010} facets synergistically boost photocatalytic water oxidation and the selective N=N coupling reaction of 5-amino-1H-tetrazole
Hu, J; He, H; Zhou, X; Li, Z; Shen, Q; Luo, W; Alsaedi, A; Hayat, T; Zhou, Y; Zou, Z
Chemical Communications, Royal Society of Chemistry, 55, 39, 5635-5638, 12 Apr. 2019, Peer-reviwed
Scientific journal, English

Role of GeI2 and SnF2 additives for SnGe perovskite solar cells
Chi Huey Ng; Kohei Nishimura; Nozomi Ito; Kengo Hamada; Daisuke Hirotani; Zhen Wang; Fu Yang; Satoshi likubo; Qing Shen; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Nano Energy, Elsevier BV, 58, 130-137, Apr. 2019, Peer-reviwed
Scientific journal, English

Highly symmetrical, 24-faceted, concave BiVO4 polyhedron bounded by multiple high-index facets for prominent photocatalytic O2 evolution under visible light
Zhou, Yong; Zou, Zhigang; Li, Zhaosheng; Shen, Qing; Wu, Congping; Zhou, Xin; Luo, Wenjun; Asiri, Abdullah M; He, Huichao; Hu, Jianqiang
Chemical Communications, 0, 0-0, 26 Mar. 2019, Peer-reviwed
Scientific journal, English

Highly symmetrical, 24-faceted, concave BiVO4 polyhedron bounded by multiple high-index facets for prominent photocatalytic O2 evolution under visible light
Zhou, Yong; Zou, Zhigang; Li, Zhaosheng; Shen, Qing; Wu, Congping; Zhou, Xin; Luo, Wenjun; Asiri, Abdullah M; He, Huichao; Hu, Jianqiang
Chemical Communications, 55, 33, 4777-4780, 26 Mar. 2019, Peer-reviwed
Scientific journal, English

Thiourea-assisted coating of dispersed copper electrocatalysts on Si photocathodes for solar hydrogen production
Pin Wang; Ziyu Yin; Linfeng Gao; Hui Li; Tongyu Zhang; Qing Shen; Jun Lv; Yingfang Yao; Wenjun Luo; Zhigang Zou
Journal of Energy Chemistry, 40, 75-80, 06 Mar. 2019, Peer-reviwed
Scientific journal, English

GeI2 Additive for High Optoelectronic Quality CsPbI3 Quantum Dots and Their Application in Photovoltaic Devices
Feng Liu; Chao Ding; Yaohong Zhang; Taichi Kamisaka; Qian Zhao; Joseph M. Luther; Taro Toyoda; Shuzi Hayase; Takashi Minemoto; Kenji Yoshino; Bing Zhang; Songyuan Dai; Junke Jiang; Shuxia Tao; Qing Shen
Chemistry of Materials, 31, 3324-3326, 14 Jan. 2019, Peer-reviwed
Scientific journal, English

Surface coatings for improving solar cell efficiencies
Qing Shen; Chao Ding; Yaohong Zhang; Feng Liu; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Optics InfoBase Conference Papers, OSA - The Optical Society, 2019, 2019
International conference proceedings, English

Solar-pumped fiber laser with all-inorganic cesium lead halide perovskite quantum dots
Taizo Masuda; Mitsuhiro Iyoda; Yuta Yasumatsu; Kiyoto Sasaki; Yaohong Zhang; Chao Ding; Feng Liu; Qing Shen; Masamori Endo
Proceedings of SPIE - The International Society for Optical Engineering, 10897, 2019
International conference proceedings

Effect of Precursor Solution Aging on the Thermoelectric Performance of CsSnI3 Thin Film
Ajay Kumar Baranwal; Shrikant Saini; Zhen Wang; Kengo Hamada; Daisuke Hirotani; Kohei Nishimura; Muhammad Akmal Kamarudin; Gaurav Kapil; Tomohide Yabuki; Satoshi Iikubo; Qing Shen; Koji Miyazaki; Shuzi Hayase
Journal of Electronic Materials, 2019, Peer-reviwed
Scientific journal

The effect of transparent conductive oxide substrate on the efficiency of snge-perovskite solar cells
Kengo Hamada; Muhammad Akmal Kamarudin; Wang Zhen; Daisuke Hirotani; Qing Shen; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Taro Toyoda; Shuzi Hayase
Journal of Photopolymer Science and Technology, 32, 4, 597-602, 2019, Peer-reviwed
Scientific journal

Role of GeI2 and SnF2 additives for SnGe perovskite solar cells
Ng, Chi Huey; Nishimura, Kohei; Ito, Nozomi; Hamada, Kengo; Hirotani, Daisuke; Wang, Zhen; Yang, Fu; likubo, Satoshi; Shen, Qing; Yoshino, Kenji; Minemoto, Takashi; Hayase, Shuzi
Nano Energy, Elsevier BV, 58, 130-137, 2019, Peer-reviwed
Scientific journal, English

Determination of iron species, including biomineralized jarosite, in the iron-hyperaccumulator moss Scopelophila ligulata by Mössbauer, X-ray diffraction, and elemental analyses
Nakajima, Hiromitsu; Okazawa, Atsushi; Kubuki, Shiro; Shen, Qing; Itoh, Kiminori
Biometals, 32, 1, 171-184, 2019, Peer-reviwed
Scientific journal, English

Improving Photovoltaic Performance of ZnO Nanowires Based Colloidal Quantum Dot Solar Cells via SnO2 Passivation Strategy
Shuhei Ozu; Yaohong Zhang; Hironobu Yasuda; Yukiko Kitabatake; Taro Toyoda; Masayuki Hirata; Kenji Yoshino; Kenji Katayama; Shuzi Hayase; Ruixiang Wang; Qing Shen
Front. Energy Res., 7, 11, 2019, Peer-reviwed, Invited
Scientific journal, English

Pb-free Sn perovskite solar cells doped with samarium iodide
Kengo Hamada; Daisuke Hirotani; Muhammad Akmal Kamarudin; Kohei Nishimura; Qing Shen; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Taro Toyoda; Shuzi Hayase
Chemistry Letters, The Chemical Society of Japan, 48, 8, 836-839, 2019, Peer-reviwed
Scientific journal, English

Improving Photovoltaic Performance of ZnO Nanowires Based Colloidal Quantum Dot Solar Cells via SnO2 Passivation Strategy
Shuhei Ozu; Yaohong Zhang; Hironobu Yasuda; Yukiko Kitabatake; Taro Toyoda; Masayuki Hirata; Kenji Yoshino; Kenji Katayama; Shuzi Hayase; Ruixiang Wang; Qing Shen
Front. Energy Res, 7, 11-19, 2019, Peer-reviwed, Invited
Scientific journal, English

Two-Step Synthesis of Laminar Vanadate via a Facile Hydrothermal Route and Enhancing the Photocatalytic Reduction of CO2 into Solar Fuel through Tuning of the Oxygen Vacancies by in Situ Vacuum Illumination Treatment
Xingyu Chen; Chen Zhuang; Xiaoqi Wang; Aizhen Liao; Liang Li; Qi Liu; Ying Tang; Congping Wu; Qing Shen; Zhentao Yu; Yong Zhou; Zhigang Zou
ACS Applied Energy Materials, American Chemical Society, 1, 12, 6857-6864, 24 Dec. 2018
Scientific journal, English

The Interparticle Distance Limit for Multiple Exciton Dissociation in PbS Quantum Dot Solid Films
Naoki Nakazawa; Yaohong Zhang; Feng Liu; Chao Ding; Kanae Hori; Taro Toyoda; Yingfang Yao; Yong Zhou; Shuji Hayase; Ruixiang Wang; Zhigang Zou; Qing Shen
Nanoscale Horizons, 4, 2, 445-451, 20 Dec. 2018, Peer-reviwed, True, Understanding the behaviour of multiple exciton dissociation in quantum dot (QD) solid films is of fundamental interest and paramount importance for improving the performance of quantum dot solar cells (QDSCs). Unfortunately, the charge transfer behaviour of photogenerated multiple exciton in QD solid films is not clear to date. Herein, we systematically investigate the multiple exciton charge transfer behaviour in PbS QD solid films by using ultrafast transient absorption spectroscopy. We observe that the multiple exciton charge transfer rate within QD ensembles is exponentially enhanced as the interparticle distance between the QDs decreases. Biexciton and triexciton dissociation between adjacent QDs occurs via a charge transfer tunneling effect just like single exciton, and the charge tunneling constants of the single exciton (β1: 0.67 ± 0.02 nm-1), biexciton (β2: 0.68 ± 0.05 nm-1) and triexciton (β3: 0.71 ± 0.01 nm-1) are obtained. More importantly, for the first time, the interparticle distance limit (≤4.3 nm) for multiple exciton charge transfer between adjacent QDs is found for the extraction of multiple excitons rapidly before the occurrence of Auger recombination. This result points out a vital and necessary condition for the use of multiple excitons produced in PbS QD films, especially for their applications in QDSCs.
Scientific journal, English

New Tin(II) Fluoride Derivative as a Precursor for Enhancing the Efficiency of Inverted Planar Tin/Lead Perovskite Solar Cells
Teresa S. Ripolles; Daiki Yamasuso; Yaohong Zhang; Muhammad Akmal Kamarudin; Chao Ding; Daisuke Hirotani; Qing Shen; Shuzi Hayase
Journal of Physical Chemistry C, 122, 48, 27284-27291, 06 Dec. 2018, Peer-reviwed
Scientific journal

Three-dimensional Bi2MoO6/TiO2 array heterojunction photoanode modified with cobalt phosphate cocatalyst for high-efficient photoelectrochemical water oxidation
Wang, Lu; Wang, Ruyi; Zhou, Yong; Shen, Qing; Ye, JinHua; Wu, Congping; Zou, Zhigang
Catalysis Today, 0, 0-0, 28 Nov. 2018, Peer-reviwed
Scientific journal, English

Enhanced performance of ZnO based perovskite solar cells by Nb2O5 surface passivation
Putao Zhang; Fu Yang; Gaurav Kapil; Qing Shen; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shyam S. Pandey; Tingli Ma; Shuzi Hayase
ORGANIC ELECTRONICS, 62, 615-620, Nov. 2018
Scientific journal, English

Enhancement of charge transport in quantum dots solar cells by N-butylamine-assisted sulfur-crosslinking of PbS quantum dots
Zhen Wang; Zhaosheng Hu; Muhammad Akmal Kamarudin; Gaurav Kapil; Atul Tripathi; Qing Shen; Kenji Yoshino; Takashi Minemoto; Sham S. Pandey; Shuzi Hayase
SOLAR ENERGY, 174, 399-408, Nov. 2018
Scientific journal, English

Addition Effect of Pyreneammonium Iodide to Methylammonium Lead Halide Perovskite-2D/3D Heterostructured Perovskite with Enhanced Stability
Yang, F; Hirotani, D; Kapil, G; Kamarudin, A. M; Ng, H. C; Zhang Y; Shen, Q; Hayase, S
Advanced Functional Materials, 57, 39, 122745-12749, Nov. 2018, Peer-reviwed
Scientific journal, English

Enhancement of charge transport in quantum dots solar cells by N-butylamine-assisted sulfur-crosslinking of PbS quantum dots
Zhen Wang; Zhaosheng Hu; Muhammad Akmal Kamarudin; Gaurav Kapil; Atul Tripathi; Qing Shen; Kenji Yoshino; Takashi Minemoto; Sham S. Pandey; Shuzi Hayase
Solar Energy, 174, 399-408, Nov. 2018, Peer-reviwed
Scientific journal, English

Perovskite solar cells consisting of mixed metal SnGe perovskite as light absorber and role of the Ge in the solar cell
Shuzi Hayase; Chi-Huey Nga; Kengo Hamada; Daisuke Hirotani; Akmal Kamarudin; Qing Shen; Satoshi Iikubo; Kenji Yoshino; Takashi Minemoto
Proceedings of the 3rd International Conference on Perovskite and Organic Photovoltaics and Optoelectronics, Fundació Scito, 23 Oct. 2018
International conference proceedings

All-Inorganic CsPb1−xGexI2Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance
Fu Yang; Daisuke Hirotani; Gaurav Kapil; Muhammad Akmal Kamarudin; Chi Huey Ng; Yaohong Zhang; Qing Shen; Shuzi Hayase
Angewandte Chemie - International Edition, 57, 39, 12745-12749, 24 Sep. 2018, Peer-reviwed
Scientific journal, English

All-Inorganic CsPb1-xGexI2Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance
Fu Yang; Daisuke Hirotani; Gaurav Kapil; Muhammad Akmal Kamarudin; Chi Huey Ng; Yaohong Zhang; Qing Shen; Shuzi Hayase
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 57, 39, 12745-12749, Sep. 2018
Scientific journal, English

Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy
Yaohong Zhang; Guohua Wu; Chao Ding; Feng Liu; Yingfang Yao; Yong Zhou; Congping Wu; Naoki Nakazawa; Qingxun Huang; Taro Toyoda; Ruixiang Wang; Shuzi Hayase; Zhigang Zou; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9, 13, 3598-3603, Jul. 2018
Scientific journal, English

Ultrafast selective extraction of hot holes from cesium lead iodide perovskite films
Qing Shen; Teresa S. Ripolles; Jacky Even; Yaohong Zhang; Chao Ding; Feng Liu; Takuya Izuishi; Naoki Nakazawa; Taro Toyoda; Yuhei Ogomi; Shuzi Hayase
Journal of Energy Chemistry, Elsevier B.V., 27, 4, 1170-1174, 01 Jul. 2018, Peer-reviwed
Scientific journal, English

Lead selenide colloidal quantum dot solar cells achieving high open-circuit voltage with one-step deposition strategy
Yaohong Zhang; Guohua Wu; Chao Ding; Feng Liu; Yingfang Yao; Yong Zhou; Congping Wu; Naoki Nakazawa; Qingxun Huang; Taro Toyoda; Ruixiang Wang; Shuzi Hayase; Zhigang Zhou; Qing Shen
The Journal of Physical Chemistry Letter, 9, 13, 3598-3603, 15 Jun. 2018, Peer-reviwed, True, Lead selenide (PbSe) colloidal quantum dots (CQDs) are considered to be a strong candidate for high-efficiency colloidal quantum dot solar cells (CQDSCs) due to its efficient multiple exciton generation. However, currently, even the best PbSe CQDSCs can only display open-circuit voltage ( Voc) about 0.530 V. Here, we introduce a solution-phase ligand exchange method to prepare PbI2-capped PbSe (PbSe-PbI2) CQD inks, and for the first time, the absorber layer of PbSe CQDSCs was deposited in one step by using this PbSe-PbI2 CQD inks. One-step-deposited PbSe CQDs absorber layer exhibits fast charge transfer rate, reduced energy funneling, and low trap assisted recombination. The champion large-area (active area is 0.35 cm2) PbSe CQDSCs fabricated with one-step PbSe CQDs achieve a power conversion efficiency (PCE) of 6.0% and a Voc of 0.616 V, which is the highest Voc among PbSe CQDSCs reported to date.
Scientific journal, English

Highly Efficient 17.6% Tin-Lead Mixed Perovskite Solar Cells Realized through Spike Structure
Gaurav Kapil; Teresa S. Ripolles; Kengo Hamada; Yuhei Ogomi; Takeru Bessho; Takumi Kinoshita; Jakapan Chantana; Kenji Yoshino; Qing Shen; Taro Toyoda; Takashi Minemoto; Takurou N. Murakami; Hiroshi Segawa; Shuzi Hayase
Nano Letters, 18, 6, 3600-3607, 13 Jun. 2018, Peer-reviwed
Scientific journal, English

Interface Passivation Effects on the Photovoltaic Performance of Quantum Dot Sensitized Inverse Opal TiO₂ Solar Cells
Qing Shen
Nanomaterials, Jun. 2018
Scientific journal

Hindered Formation of Photoinactive δ-FAPbI3 Phase and Hysteresis-Free Mixed-Cation Planar Heterojunction Perovskite Solar Cells with Enhanced Efficiency via Potassium Incorporation
Disheng Yao; Chunmei Zhang; Ngoc Duy Pham; Yaohong Zhang; Vincent Tiing Tiong; Aijun Du; Qing Shen; Gregory J. Wilson; Hongxia Wang
Journal of Physical Chemistry Letters, American Chemical Society, 9, 8, 2113-2120, 19 Apr. 2018, Peer-reviwed
Scientific journal, English

Mixed Sn–Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air
Nozomi Ito; Muhammad Akmal Kamarudin; Daisuke Hirotani; Yaohong Zhang; Qing Shen; Yuhei Ogomi; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Shuzi Hayase
The Journal of Physical Chemistry Letters, American Chemical Society ({ACS}), 9, 7, 1682-1688, 05 Apr. 2018, Peer-reviwed
Scientific journal, English

Hindered Formation of Photoinactive delta-FAPbl(3) Phase and Hysteresis Free Mixed-Cation Planar Heterojunction Perovskite Solar Cells with Enhanced Efficiency via Potassium Incorporation
Disheng Yao; Chunmei Zhang; Ngoc Duy Pham; Yaohong Zhang; Vincent Tiing Tiong; Aijun Du; Qing Shen; Gregory J. Wilson; Hongxia Wang
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9, 8, 2113-2120, Apr. 2018
Scientific journal, English

Understanding charge transfer and recombination by interface engineering for improving the efficiency of PbS quantum dot solar cells
Chao Ding; Yaohong Zhang; Feng Liu; Yukiko Kitabatake; Shuzi Hayase; Taro Toyoda; Ruixiang Wang; Kenji Yoshino; Takashi Minemoto; Qing Shen
Nanoscale Horizons, 3, 4, 417-429, 26 Mar. 2018, Peer-reviwed, True, In quantum dot heterojunction solar cells (QDHSCs), the QD active layer absorbs sunlight and then transfers the photogenerated electrons to an electron-transport layer (ETL). It is generally believed that the conduction band minimum (CBM) of the ETL should be lower than that of the QDs to enable efficient charge transfer from the QDs to the collection electrode (here, FTO) through the ETL. However, by employing Mg-doped ZnO (Zn1-xMgxO) as a model ETL in PbS QDHSCs, we found that an ETL with a lower CBM is not necessary to realize efficient charge transfer in QDHSCs. The existence of shallow defect states in the Zn1-xMgxO ETL can serve as additional charge-transfer pathways. In addition, the conduction band offset (CBO) between the ETL and the QD absorber has been, for the first time, revealed to significantly affect interfacial recombination in QDHSCs. We demonstrate that a spike in the band structure at the ETL/QD interface is useful for suppressing interfacial recombination and improving the open-circuit voltage. By varying the Mg doping level in ZnO, we were able to tune the CBM, defect distribution and carrier concentration in the ETL, which play key roles in charge transfer and recombination and therefore the device performance. PbS QDHSCs based on the optimized Zn1-xMgxO ETL exhibited a high power conversion efficiency of 10.6%. Our findings provide important guidance for enhancing the photovoltaic performance of QD-based solar cells.
Scientific journal, English

Octadecylamine-Functionalized Single-Walled Carbon Nanotubes for Facilitating the Formation of a Monolithic Perovskite Layer and Stable Solar Cells
Vincent Tiing Tiong; Ngoc Duy Pham; Teng Wang; Tianxiang Zhu; Xinluo Zhao; Yaohong Zhang; Qing Shen; John Bell; Linhua Hu; Songyuan Dai; Hongxia Wang
Advanced Functional Materials, Wiley-VCH Verlag, 28, 10, 1705545, 07 Mar. 2018, Peer-reviwed
Scientific journal, English

Octadecylamine-Functionalized Single-Walled Carbon Nanotubes for Facilitating the Formation of a Monolithic Perovskite Layer and Stable Solar Cells
Vincent Tiing Tiong; Ngoc Duy Pham; Teng Wang; Tianxiang Zhu; Xinluo Zhao; Yaohong Zhang; Qing Shen; John Bell; Linhua Hu; Songyuan Dai; Hongxia Wang
ADVANCED FUNCTIONAL MATERIALS, 28, 10, Mar. 2018
Scientific journal, English

Growth Mechanism of ZnO Thin Films Grown by Spray Pyrolysis Using Diethylzinc Solution
Masato Imai; Marin Watanabe; Himeka Tominaga; Kenji Yoshino; Yuhei Ogomi; Qing Shen; Taro Toyoda; Takashi Minemoto; Shuzi Hayase
Physica Status Solidi (A) Applications and Materials Science, Wiley-VCH Verlag, 215, 4, 1700406, 21 Feb. 2018, Peer-reviwed
Scientific journal, English

Charge carrier kinetics in hematite with NiFeOx coating in aqueous solutions: Dependence on bias voltage
Woon Yong Sohn; James E. Thorne; Yaohong Zhang; Shota Kuwahara; Qing Shen; Dunwei Wang; Kenji Katayama
Journal of Photochemistry and Photobiology A: Chemistry, Elsevier B.V., 353, 15, 344-348, 15 Feb. 2018, Peer-reviwed
Scientific journal, English

Ultrafast Electron Injection from Photoexcited Perovskite CsPbI3 QDs into TiO2 Nanoparticles with Injection Efficiency near 99%
Feng Liu; Yaohong Zhang; Chao Ding; Taro Toyoda; Yuhei Ogomi; Teresa S. Ripolles; Shuzi Hayase; Takashi Minemoto; Kenji Yoshino; Songyuan Dai; Qing Shen
Journal of Physical Chemistry Letters, American Chemical Society, 9, 2, 294-297, 18 Jan. 2018, Peer-reviwed
Scientific journal, English

Interface passivation effects on the photovoltaic performance of quantum dot sensitized inverse opal TiO2
Kanae Hori; Yaohong Zhang; Pimsiri Tusamalee; Naoki Nakazawa; Yasuha Yoshihara; Ruixiang Wang; Taro Toyoda; Shuzi Hayase; Qing Shen
Nanomaterials, 8, 460, 2018, Peer-reviwed
Scientific journal, English

Enhanced performance of ZnO based perovskite solar cells by Nb2O5 surface passivation
Putao Zhang; Fu Yang; Gaurav Kapil; Qing Shen; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shyam S. Pandey; Tingli Ma; Shuzi Hayase
Organic Electronics, 62, 615-620, 2018, Peer-reviwed
Scientific journal, English

Solution-Processed Air-Stable Copper Bismuth Iodide for Photovoltaics
Zhaosheng Hu; Zhen Wang; Gaurav Kapil; Tingli Ma; Satoshi Iikubo; Takashi Minemoto; Kenji Yoshino; Taro Toyoda; Qing Shen; Shuzi Hayase
ChemSusChem, 11, 17, 2930-2935, 2018, Peer-reviwed, True, Bismuth-based solar cells have been under intensive interest as an efficient non-toxic absorber in photovoltaics. Within this new family of semiconductors, we herein report a new, long-term stable copper bismuth iodide (CuBiI4 ). A solutionprocessed method under air atmosphere is used to prepare the material. The adopted HI-assisted dimethylacetamide (DMA) co-solvent can completely dissolve CuI and BiI3 powders with high concentration compared with other organic solvents. Moreover, the high vapor pressure of tributyl phosphate, selected for the solvent vapor annealing (SVA), enables complete low-temperature (≤70 °C) film preparation, resulting in a stable, uniform, dense CuBiI4 film. The average grain size increases with the precursor concentration, greatly improving the photoluminescence lifetime and hall mobility; a carrier lifetime of 3.03 ns as well as an appreciable hall mobility of 110 cm2  V-1 s-1 were obtained. XRD illustrates that the crystal structure is cubic (space group Fd3m) and favored in the [1 1 1] direction. Moreover, the photovoltaic performance of CuBiI4 was also investigated. A wide bandgap (2.67 eV) solar cell with 0.82 % power conversion efficiency is presented, which exhibits excellent long-term stability over 1008 h under ambient conditions. This air-stable material may give an application in future tandem solar cells as a stable short-wavelength light absorber.
Scientific journal, English

Effect of the conduction band offset on interfacial recombination behavior of the planar perovskite solar cells
Chao Ding; Yaohong Zhang; Feng Liu; Yukiko Kitabatake; Shuzi Hayase; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Kenji Katayama; Qing Shen
Nano Energy, 53, 17-26, 2018, Peer-reviwed
Scientific journal, English

Construction of Al-ZnO/CdS Photoanodes Modified with Distinctive Alumina Passivation Layer for Improvement of Photoelectrochemical Efficiency and Stability
Yong Zhou; Zhigang Zou; Ruyi Wang; Dong Li; Lu Wang; Xirui Zhao; Guangcheng Yang; Ai-Dong Li; Congping Wu; Qing Shen
Nanoscale, 10, 19621-19627, 2018, Peer-reviwed
Scientific journal, English

Anisotropic Crystal Growth, Optical Absorption, and Ground-​State Energy Level of CdSe Quantum Dots Adsorbed on the (001) and (102) Surfaces of Anatase-​TiO2: Quantum Dot-​Sensitization System
Toyoda, Taro; Shen, Qing; Hironaka, Motoki; Kamiyama, Keita; Kobayashi, Hisayoshi; Hirose, Yasushi; Hayase, Shuzi
Journal of Physical Chemistry C, 122, 29200-29209, 2018, Peer-reviwed
Scientific journal, English

Crystal Growth, Exponential Optical Absorption Edge, and Ground State Energy Level of PbS Quantum Dots Adsorbed on the (001), (110), and (111) Surfaces of Rutile-TiO2
Taro Toyoda; Qing Shen; Kanae Hori; Naoki Nakazawa; Keita Kamiyama; Shuzi Hayase
The Journal of Physical Chemistry C, 122, 25, 13590-13599, 2018, Peer-reviwed
Scientific journal, English

Dependences of the Optical Absorption, Ground State Energy Level, and Interfacial Electron Transfer Dynamics on the Size of CdSe Quantum Dots Adsorbed on the (001), (110), and (111) Surfaces of Single Crystal Rutile TiO2
Taro Toyoda; Qing Shen; Keita Kamiyama; Kenji Katayama; Shuzi Hayase
JOURNAL OF PHYSICAL CHEMISTRY C, 121, 45, 25390-25401, Nov. 2017, Peer-reviwed
Scientific journal, English

Colloidal Synthesis of Air-Stable Alloyed CsSn1-xPxI3 Perovskite Nanocrystals for Use in Solar Cells
Feng Liu; Chao Ding; Yaohong Zhang; Teresa S. Ripolles; Taichi Kamisaka; Taro Toyoda; Shuzi Hayase; Takashi Minemoto; Kenji Yoshino; Songyuan Dai; Masatoshi Yanagida; Hidenori Noguchi; Qing Shen
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 139, 46, 16708-16719, Nov. 2017, Peer-reviwed
Scientific journal, English

Study to realize the effect of multiple monovalent cation for lead/tin mixed perovskite solar cells
Gaurav Kapil; Kengo Hamada; Yuhei Ogomi; Takeru Bessho; Takumi Kinoshita; Qing Shen; Taro Toyoda; Takurou N Murakami; Hiroshi Segawa; Shuzi Hayase
Proceedings of the 2nd Asia-Pacific Hybrid and Organic Photovoltaics, Fundació Scito, 27 Oct. 2017
International conference proceedings

Copper deficient Zn-Cu-In-Se quantum dot sensitized solar cells for high efficiency
Linlin Zhang; Zhenxiao Pan; Wei Wang; Jun Du; Zhenwei Ren; Qing Shen; Xinhua Zhong
JOURNAL OF MATERIALS CHEMISTRY A, 5, 40, 21442-21451, Oct. 2017, Peer-reviwed
Scientific journal, English

Highly Luminescent Phase-Stable CsPbl(3) Perovskite Quantum Dots Achieving Near 100% Absolute Photoluminescence Quantum Yield
Feng Liu; Yaohong Zhang; Chao Ding; Syuusuke Kobayashi; Takuya Izuishi; Naoki Nakazawa; Taro Toyoda; Tsuyoshi Ohta; Shuzi Hayase; Takashi Minemoto; Kenji Yoshino; Songyuan Dai; Qing Shen
ACS NANO, 11, 10, 10373-10383, Oct. 2017, Peer-reviwed
Scientific journal, English

Slow hot carrier cooling in cesium lead iodide perovskites
Qing Shen; Teresa S. Ripolles; Jacky Even; Yuhei Ogomi; Koji Nishinaka; Takuya Izuishi; Naoki Nakazawa; Yaohong Zhang; Chao Ding; Feng Liu; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Kenji Katayama; Shuzi Hayase
APPLIED PHYSICS LETTERS, 111, 15, 153903, Oct. 2017, Peer-reviwed
Scientific journal, English

Enhancement of efficiency for mixed metal Sn/Pb perovskite solar cells from the view point of hetero-interface traps (Conference Presentation)
Yuhei Ogomi; Daiki Yamasuso; Ayumu Yonaha; Kengo Hamada; Erina Yamaguchi; Qing Shen; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Organic, Hybrid, and Perovskite Photovoltaics XVIII, SPIE, 34-34, 19 Sep. 2017
International conference proceedings

Hole-Transport Materials Containing Triphenylamine Donors with a Spiro[fluorene-9,9 '-xanthene] Core for Efficient and Stable Large Area Perovskite Solar Cells
Guohua Wu; Yaohong Zhang; Ryuji Kaneko; Yoshiyuki Kojima; Kosuke Sugawa; Towhid H. Chowdhury; Ashraful Islam; Qing Shen; Md. Akhtaruzzaman; Takeshi Noda; Joe Otsuki
SOLAR RRL, 1, 9, Sep. 2017
Scientific journal, English

Anomalous enhancement by alkylamine of the dye-sensitized solar cells using TEMPO redox
Taisei Nishimura; Woon Yong Sohn; Qing Shen; Shota Kuwahara; Kenji Katayama
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 346, 281-286, Sep. 2017, Peer-reviwed
Scientific journal, English

Optimization of Experimental Parameters for the Performance of Solid-state Dye-sensitized Solar Cells
Miki Yamaguchi; Taisei Nisimura; Woon Yong Sohn; Qing Shen; Shota Kuwahara; Kenji Katayama
ANALYTICAL SCIENCES, 33, 9, 1041-1046, Sep. 2017, Peer-reviwed
Scientific journal, English

Electron transport properties in dye-sensitized solar cells with {001} facet-dominant TiO2 nanoparticles
M. M. Maitani; K. Tanaka; Q. Shen; T. Toyoda; Y. Wada
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 33, 22129-22140, Sep. 2017, Peer-reviwed
Scientific journal, English

Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers
Chao Ding; Yaohong Zhang; Feng Liu; Naoki Nakazawa; Qingxun Huang; Shuzi Hayase; Yuhei Ogomi; Taro Toyoda; Ruixiang Wang; Qing Shen
ACS Appl. Mater. Interfaces, 10, 31, 26142-26152, 01 Sep. 2017, Peer-reviwed, True, Using spatial energy-level gradient engineering with quantum dots (QDs) of different sizes to increase the generated carrier collection at the junction of a QD heterojunction solar cell (QDHSC) is a hopeful route for improving the energy-conversion efficiency. However, the results of current related research have shown that a variable band-gap structure in a QDHSC will create an appreciable increase, not in the illumination current density, but rather in the fill factor. In addition, there are a lack of studies on the mechanism of the effect of these graded structures on the photovoltaic performance of QDHSCs. This study presents the development of air atmosphere solution-processed TiO2/PbS QDs/Au QDHSCs by engineering the energy-level alignment (ELA) of the active layer via the use of a sorted order of differently sized QD layers (four QD sizes). In comparison to the ungraded device (without the ELA), the optimized graded architecture (containing the ELA) solar cells exhibited a great increase (21.4%) in short-circuit current density ( Jsc). As a result, a Jsc value greater than 30 mA/cm2 has been realized in planar, thinner absorption layer (∼300 nm) PbS QDHSCs, and the open-circuit voltage ( Voc) and power-conversion efficiency (PCE) were also improved. Through characterization by the light intensity dependences of the Jsc and Voc and transient photovoltage decay, we find that (i) the ELA structure, serving as an electron-blocking layer, reduces the interfacial recombination at the PbS/anode interface, and (ii) the ELA structure can drive more carriers toward the desirable collection electrode, and the additional carriers can fill the trap states, reducing the trap-assisted recombination in the PbS QDHSCs. This work has clearly elucidated the mechanism of the recombination suppression in the graded QDHSCs and demonstrated the effects of ELA structure on the improvement of Jsc. The charge recombination mechanisms characterized in this work would be able to shed light on further improvements of QDHSCs, which could even benefit other types of solar cells.
Scientific journal, English

A 2,1,3-Benzooxadiazole Moiety in a D-A-D-type Hole-Transporting Material for Boosting the Photovoltage in Perovskite Solar Cells
Guohua Wu; Yaohong Zhang; Ryuji Kaneko; Yoshiyuki Kojima; Qing Shen; Ashraful Islam; Kosuke Sugawa; Joe Otsuki
JOURNAL OF PHYSICAL CHEMISTRY C, 121, 33, 17617-17624, Aug. 2017, Peer-reviwed
Scientific journal, English

High Efficiency Quantum Dot Sensitized Solar Cells Based on Direct Adsorption of Quantum Dots on Photoanodes
Wenran Wang; Guocan Jiang; Juan Yu; Wei Wang; Zhenxiao Pan; Naoki Nakazawa; Qing Shen; Xinhua Zhong
ACS APPLIED MATERIALS & INTERFACES, 9, 27, 22549-22559, Jul. 2017, Peer-reviwed
Scientific journal, English

Investigation of Interfacial Charge Transfer in Solution Processed Cs2SnI6 Thin Films
Gaurav Kapil; Ttakeshi Ohta; Tsuguo Koyanagi; Murugan Vigneshwaran; Yaohong Zhang; Yuhei Ogomi; Shyam S. Pandey; Kenji Yoshino; Qing Shen; Taro Toyoda; Md. Mijanur Rahman; Takashi Minemoto; Takurou N. Murakami; Hiroshi Segawa; Shuzi Hayase
JOURNAL OF PHYSICAL CHEMISTRY C, 121, 24, 13092-13100, Jun. 2017, Peer-reviwed
Scientific journal, English

Atmospheric growth of ZnO films deposited by spray pyrolysis using diethylzinc solution
Masato Imai; Marin Watanabe; Akiko Mochihara; Himeka Tominaga; Kenji Yoshino; Qing Shen; Taro Toyoda; Shuzi Hayase
JOURNAL OF CRYSTAL GROWTH, 468, 473-476, Jun. 2017, Peer-reviwed
Scientific journal, English

Fabrication, characterization and application of fully green superhydrophilic lignosulfonate multilayer films
Li Chen; Di-lai Lu; Jia-Ru Ye; Qing Shen
MATERIALS LETTERS, 194, 217-219, May 2017, Peer-reviwed
Scientific journal, English

Improvement of Photovoltaic Performance of Colloidal Quantum Dot Solar Cells Using Organic Small Molecule as Hole-Selective Layer
Yaohong Zhang; Guohua Wu; Ivan Mora-Sero; Chao Ding; Feng Liu; Qingxun Huang; Yuhei Ogomi; Shuzi Hayase; Taro Toyoda; Ruixiang Wang; Joe Otsuki; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 8, 10, 2163-2169, May 2017, Peer-reviwed
Scientific journal, English

Photoelectrochemical water reduction over wide gap (Ag,Cu)(In,Ga)S-2 thin film photocathodes
Wilman Septina; Minori Sugimoto; Ding Chao; Qing Shen; Shigeru Nakatsuka; Yoshitaro Nose; Takashi Harada; Shigeru Ikeda
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 19, 12502-12508, May 2017, Peer-reviwed
Scientific journal, English

Ligand-dependent exciton dynamics and photovoltaic properties of PbS quantum dot heterojunction solar cells
Jin Chang; Yuhei Ogomi; Chao Ding; Yao Hong Zhang; Taro Toyoda; Shuzi Hayase; Kenji Katayama; Qing Shen
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 9, 6358-6367, Mar. 2017, Peer-reviwed
Scientific journal, English

Alloying Strategy in Cu-In-Ga-Se Quantum Dots for High Efficiency Quantum Dot Sensitized Solar Cells
Wenxiang Peng; Jun Du; Zhenxiao Pan; Naoki Nakazawa; Jiankun Sun; Zhonglin Du; Gencai Shen; Juan Yu; Jin-Song Hu; Qing Shen; Xinhua Zhong
ACS APPLIED MATERIALS & INTERFACES, 9, 6, 5328-5336, Feb. 2017, Peer-reviwed
Scientific journal, English

Near IR sensitive Sn based perovskite solar cells with high current density reaching 30mA/cm2
Yuhei Ogomi; Daisuke Hirotani; Kosei Fujiwara; Keita Sakaguchi; Qing Shen; Taro Toyoda; Kenji Yoshino; Atsushi Wakamiya; Teresa S. Ripolles; Shuzi Hayase
2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017, Institute of Electrical and Electronics Engineers Inc., 2957-2962, 2017
International conference proceedings, English

Photovoltaic Properties of CdSe Quantum Dot Sensitized Inverse Opal TiO2 Solar Cells: The Effect of TiCl4 Post Treatment
Motoki Hironaka; Taro Toyoda; Kanae Hori; Yuhei Ogomi; Shuzi Hayase; Qing Shen
Journal of Modern Physics, 8, 522-530, 2017, Peer-reviwed
Scientific journal, English

Hole-Transport Materials Containing Triphenylamine Donors with a Spiro[fluorene-9,9'-xanthene] Core for Efficient and Stable Large Area Perovskite Solar Cells
Guohua Wu; Yaohong Zhang; Ryuji Kaneko; Yoshiyuki Kojima; Kosuke Sugawa; Towhid; H. Chowdhury; Ashraful Islam; Qing Shen; Md. Akhtaruzzaman; Takeshi Noda; Joe Otsuki
Solar RRL, 1, 9, 1700096, 2017, Peer-reviwed
Scientific journal, English

Air Stable PbSe Colloidal Quantum Dot Heterojunction Solar Cells: Ligand-Dependent Exciton Dissociation, Recombination, Photovoltaic Property, and Stability
Yaohong Zhang; Chao Ding; Guohua Wu; Naoki Nakazawa; Jin Chang; Yuhei Ogomi; Taro Toyoda; Shuzi Hayase; Kenji Katayama; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY C, 120, 50, 28509-28518, Dec. 2016, Peer-reviwed
Scientific journal, English

Near IR sensitive Sn based perovskite solar cells with high current density reaching 30mA/cm²
Ogomi Y; Hirotani D; Fujiwara K; Sakaguchi K; Shen Q; Toyoda T; Yoshino K; Wakamiya A; Ripolles T; Hayase S
Conference Record of the IEEE Photovoltaic Specialists Conference, Conference Record of the IEEE Photovoltaic Specialists Conference, 2016-November, 808-811, 18 Nov. 2016, © 2016 IEEE. Enhancing Jsc of solar cells consisting of mixed metal perovskite, MASn0.5Pb0.5I3 (SnPb PVK), is reported. The SnPb PVK was prepared from Pbt/SnL· mixture or SnI2(DMSO)2/PbI2(DMSO)2 mixture, where these PVK are abbreviated as SnPb-A PVK and SnPb-B PVK, respectively. Urbach energy's sharpness factor (σ) for SnPb-B PVK was 1.5 which was higher than 0.5 for SnPb-A PVK, suggesting that the SnPb-B PVK has less crystal disordering than the SnPb-A PVK. The Jsc of the SnPb-B PVK cell was improved to 30 mA/cm2, compared to 20 mA/cm2for SnPb-A PVK cell. The carrier dynamics is discussed by transient spectroscopy studies.
Scientific journal, Japanese

Thiocyanate-free asymmetric ruthenium (II) dye sensitizers containing azole chromophores with near-IR light-harvesting capacity
Guohua Wu; Ryuji Kaneko; Ashraful Islam; Yaohong Zhang; Kosuke Sugawa; Liyuan Han; Qing Shen; Idriss Bedja; Ravindra Kumar Gupta; Joe Otsuki
Journal of Power sources, Elsevier, 331, 100-111, Nov. 2016, Peer-reviwed
Scientific journal, English

Recent progress on quantum dot solar cells: a review
Tomah Sogabe; Qing Shen; Koichi Yamaguchi
JOURNAL OF PHOTONICS FOR ENERGY, 6, 4, 040901, Oct. 2016, Peer-reviwed
Scientific journal, English

The effect of CdS on the charge separation and recombination dynamics in PbS/CdS double-layered quantum dot sensitized solar cells
Koki Sato; Keita Ono; Takuya Izuishi; Shota Kuwahara; Kenji Katayama; Taro Toyoda; Shuzi Hayase; Qing Shen
CHEMICAL PHYSICS, 478, 159-163, Oct. 2016, Peer-reviwed
Scientific journal, English

Architecture of the Interface between the Perovskite and Hole-Transport Layers in Perovskite Solar Cells
Masahiro Moriya; Daisuke Hirotani; Tsuyoshi Ohta; Yuhei Ogomi; Qing Shen; Teresa S. Ripolles; Kenji Yoshino; Taro Toyoda; Takashi Minemoto; Shuzi Hayase
CHEMSUSCHEM, 9, 18, 2634-2639, Sep. 2016, Peer-reviwed
Scientific journal, English

Facile Synthesis and Characterization of Sulfur Doped Low Bandgap Bismuth Based Perovskites by Soluble Precursor Route
Murugan Vigneshwaran; Takeshi Ohta; Satoshi Iikubo; Gaurav Kapil; Teresa S. Ripolles; Yuhei Ogomi; Ting Ma; Shyam S. Pandey; Qing Shen; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
CHEMISTRY OF MATERIALS, 28, 18, 6436-6440, Sep. 2016, Peer-reviwed
Scientific journal, English

Novel Y doped BiVO4 thin film electrodes for enhanced photoelectric and photocatalytic performance
Yaohong Zhang; Zhiguo Yi; Guohua Wu; Qing Shen
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 327, 25-32, Aug. 2016, Peer-reviwed
Scientific journal, English

Adsorption and Electronic Structure of CdSe Quantum Dots on Single Crystal ZnO: A Basic Study of Quantum Dot-Sensitization System
Taro Toyoda; Witoon Yindeesuk; Keita Kamiyama; Shuzi Hayase; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY C, 120, 30, 16367-16376, Aug. 2016, Peer-reviwed
Scientific journal, English

Neutral and anionic tetrazole-based ligands in designing novel ruthenium dyes for dye-sensitized solar cells
Guohua Wu; Ryuji Kaneko; Yaohong Zhang; Yoshinao Shinozaki; Kosuke Sugawa; Ashraful Islam; Liyuan Han; Idriss Bedja; Ravindra Kumar Gupta; Qing Shen; Joe Otsuki
JOURNAL OF POWER SOURCES, 307, 18, 416-425, Mar. 2016, Peer-reviwed
Scientific journal, English

Zn-Cu-In-Se Quantum Dot Solar Cells with a Certified Power Conversion Efficiency of 11.6%
Jun Du; Zhonglin Du; Jin-Song Hu; Zhenxiao Pan; Qing Shen; Jiankun Sung; Donghui Long; Hui Dong; Litao Sun; Xinhua Zhong; Li-Jun Wan
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 138, 12, 4201-4209, Mar. 2016, Peer-reviwed
Scientific journal, English

Low-temperature Growth of Porous and Dense ZnO Films for Perovskite Solar Cells on ITO Substrate
Kenji Yoshino; Akiko Ide; Akiko Mochihara; Yuhei Ogomi; Qing Shen; Taro Toyoda; Shuzi Hayase
CHEMISTRY LETTERS, 45, 2, 176-178, Feb. 2016, Peer-reviwed
Scientific journal, English

The Electronic Structure and Photoinduced Electron Transfer Rate of CdSe Quantum Dots on Single Crystal Rutile TiO2: Dependence on the Crystal Orientation of the Substrate
Taro Toyoda; Witoon Yindeesuk; Keita Karniyama; Kenji Katayama; Hisayoshi Kobayashi; Shuzi Hayase; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY C, 120, 4, 2047-2057, Feb. 2016, Peer-reviwed
Scientific journal, English

Mn doped quantum dot sensitized solar cells with power conversion efficiency exceeding 9%
Jin Wang; Yan Li; Qing Shen; Takuya Izuishi; Zhenxiao Pan; Ke Zhao; Xinhua Zhong
JOURNAL OF MATERIALS CHEMISTRY A, 4, 3, 877-886, 2016, Peer-reviwed
Scientific journal, English

Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%
Shuang Jiao; Jin Wang; Qing Shen; Yan Li; Xinhua Zhong
JOURNAL OF MATERIALS CHEMISTRY A, 4, 19, 7214-7221, 2016, Peer-reviwed
Scientific journal, English

CdSeTe/CdS Type-I Core/Shell Quantum Dot Sensitized Solar Cells with Efficiency over 9%
Junwei Yang; Jin Wang; Ke Zhao; Takuya Izuishi; Yan Li; Qing Shen; Xinhua Zhong
JOURNAL OF PHYSICAL CHEMISTRY C, 119, 52, 28800-28808, Dec. 2015
Scientific journal, English

Uncovering the charge transfer and recombination mechanism in ZnS-coated PbS quantum dot sensitized solar cells
Jin Chang; Takuya Oshima; Sojiro Hachiya; Konki Sato; Taro Toyoda; Kenji Katayama; Shuzi Hayase; Qing Shen
SOLAR ENERGY, 122, 307-313, Dec. 2015, Peer-reviwed, Invited
Scientific journal, English

Effects of different chloride precursors on crystal growth of lead halide perovskites
Vigneshwaran Murugan; Yuhei Ogomi; Shyam S. Pandey; Taro Toyoda; Qing Shen; Shuzi Hayase
APPLIED PHYSICS EXPRESS, 8, 12, 125501, Dec. 2015, Peer-reviwed
Scientific journal, English

CdSeTe/CdS Type-I Core/Shell Quantum Dot Sensitized Solar Cells with Efficiency over 9%
Junwei Yang; Jin Wang; Ke Zhao; Takuya Izuishi; Yan Li; Qing Shen; Xinhua Zhong
JOURNAL OF PHYSICAL CHEMISTRY C, 119, 52, 28800-28808, Dec. 2015, Peer-reviwed
Scientific journal, English

Characterization of hot carrier cooling and multiple exciton generation dynamics in PbS Qps using an improved transient grating technique
Qing Shen; Kenji Katayama; Taro Toyoda
JOURNAL OF ENERGY CHEMISTRY, 24, 6, 712-716, Nov. 2015, Peer-reviwed
Scientific journal, English

Blocking Effect for Carrier Transfer to Triiodide in Alkyl-Functionalized Dyes in Dye-Sensitized Solar Cell
Keita Omata; Shota Kuwahara; Ryo Hosokawa; Taisei Nishimura; Qing Shen; Taro Toyoda; Kenji Katayama
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 88, 9, 1308-1313, Sep. 2015, Peer-reviwed
Scientific journal, English

Effect of defects in TiO2 nanotube thin film on the photovoltaic properties of quantum dot-sensitized solar cells
Masaya Akimoto; Taro Toyoda; Tsuyoshi Okuno; Shuji Hayase; Qing Shen
THIN SOLID FILMS, 590, 90-97, Sep. 2015, Peer-reviwed
Scientific journal, English

Upconversion Luminescence of Er3+/Yb3+ Co-doped La2O3-TiO2-ZrO2 Glasses Prepared by Containerless Processing
Zhu Mei-Juan; Yu Jian-Ding; Zhang Ming-Hui; Gu Yan-Jing; Li Qin; Fang Bi-Jun; Zhao Hong-Yang; Shen Qing
JOURNAL OF INORGANIC MATERIALS, 30, 4, 391-396, Apr. 2015, Peer-reviwed
Scientific journal, Chinese

Infrared light sensitive Sn/Pb binary perovskite solar cells with improved stability in air and organic amine-free perovskite solar cells with improved stability against light exposure
Yuhei Ogomi; Qing Shen; Koji Nishinaka; Teresa S. Ripolles; Kosei Fujiwara; Keita Sakaguchi; Taro Toyoda; Shuzi Hayase
2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), 2015, Peer-reviwed
International conference proceedings, English

The cause for the low efficiency of dye sensitized solar cells with a combination of ruthenium dyes and cobalt redox
Keita Omata; Shota Kuwahara; Kenji Katayama; Shen Qing; Taro Toyoda; Kun-Mu Lee; Chun-Guey Wu
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 15, 10170-10175, 2015, Peer-reviwed
Scientific journal, English

Electronic structures of two types of TiO2 electrodes: inverse opal and nanoparticulate cases
Taro Toyoda; Witoon Yindeesuk; Tsuyoshi Okuno; Masaya Akimoto; Keita Kamiyama; Shuzi Hayase; Qing Shen
RSC ADVANCES, 5, 61, 49623-49632, 2015, Peer-reviwed
Scientific journal, English

Band Engineering in Core/Shell ZnTe/CdSe for Photovoltage and Efficiency Enhancement in Exciplex Quantum Dot Sensitized Solar Cells
Shuang Jiao; Qing Shen; Ivan Mora-Sero; Jin Wang; Zhenxiao Pan; Ke Zhao; Yuki Kuga; Xinhua Zhong; Juan Bisquert
ACS NANO, 9, 1, 908-915, Jan. 2015, Peer-reviwed
Scientific journal, English

High reduction of interfacial charge recombination in colloidal quantum dot solar cells by metal oxide surface passivation
Jin Chang; Yuki Kuga; Ivan Mora-Sero; Taro Toyoda; Yuhei Ogomi; Shuzi Hayase; Juan Bisquert; Qing Shen
NANOSCALE, 7, 12, 5446-5456, 2015, Peer-reviwed
Scientific journal, English

Optical absorption, charge separation and recombination dynamics in Sn/Pb cocktail perovskite solar cells and their relationships to photovoltaic performances
Qing Shen; Yuhei Ogomi; Jin Chang; Taro Toyoda; Kosei Fujiwara; Kenji Yoshino; Koki Sato; Kohei Yamazaki; Masaya Akimoto; Yuki Kuga; Kenji Katayama; Shuzi Hayase
JOURNAL OF MATERIALS CHEMISTRY A, 3, 17, 9308-9316, 2015, Peer-reviwed, Invited
Scientific journal, English

Photoacoustic spectroscopy of TiO2 nanotube electrode adsorbed with CdSe quantum dots and its photovoltaic properties
Masaya Akimoto; Qing Shen; Shuji Hayase; Taro Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS, 53, 7, 07KB08-1-07KB08-8, Jul. 2014, Peer-reviwed
Scientific journal, English

Effect of TiO2 Crystal Orientation on the Adsorption of CdSe Quantum Dots for Photosensitization Studied by the Photoacoustic and Photoelectron Yield Methods
Taro Toyoda; Witoon Yindeesuk; Keita Kamiyama; Shuzi Hayase; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY C, 118, 30, 16680-16687, Jul. 2014, Peer-reviwed
Scientific journal, English

All-Solid Perovskite Solar Cells with HOCO-R-NH3+I- Anchor-Group Inserted between Porous Titania and Perovskite
Yuhei Ogomi; Atsushi Morita; Shota Tsukamoto; Takahiro Saitho; Qing Shen; Taro Toyoda; Kenji Yoshino; Shyam S. Pandey; Tingli Ma; Shuzi Hayase
JOURNAL OF PHYSICAL CHEMISTRY C, 118, 30, 16651-16659, Jul. 2014, Peer-reviwed
Scientific journal, English

Photoacoustic spectroscopy of TiO
Akimoto Masaya; Shen Qing; Hayase Shuji; Toyoda Taro
Jpn. J. Appl. Phys., Institute of Physics, 53, 7, 07KB08, 17 Jun. 2014
English

High-Efficiency "Green" Quantum Dot Solar Cells
Zhenxiao Pan; Ivan Mora-Sero; Qing Shen; Hua Zhang; Yan Li; Ke Zhao; Jin Wang; Xinhua Zhong; Juan Bisquert
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 136, 25, 9203-9210, Jun. 2014, Peer-reviwed
Scientific journal, English

Control of Charge Dynamics through a Charge-Separation Interface for All-Solid Perovskite-Sensitized Solar Cells
Yuhei Ogomi; Kenji Kukihara; Shen Qing; Taro Toyoda; Kenji Yoshino; Shyam Pandey; Hisayo Momose; Shuzi Hayase
CHEMPHYSCHEM, 15, 6, 1062-1069, Apr. 2014, Peer-reviwed
Scientific journal, English

CH3NH3SnxPb(1-x)I3 Perovskite Solar Cells Covering up to 1060 nm
Yuhei Ogomi; Atsushi Morita; Syota Tsukamoto; Takahiro Saitho; Naotaka Fujikawa; Qing Shen; Taro Toyoda; Kenji Yoshino; Shyam S. Pandey; Tingli Ma; Shuzi Hayase
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 5, 6, 1004-1011, Mar. 2014, Peer-reviwed
Scientific journal, English

Light trapping considerations in self-assembled ZnO nanorod arrays for quantum dot sensitized solar cells
Chun Yan Luan; King Tai Cheung; Yishu Foo; Li Yu Yu; Qing Shen; Juan Antonio Zapien
OXIDE-BASED MATERIALS AND DEVICES V, 8987, 2014, Peer-reviwed
International conference proceedings, English

Sn halide based perovskite sensitized solar cells covering up to 1060 nm
Yuhei Ogomi; Atsushi Morita; Shota Tsukamoto; Takahiro Saito; Naotaka Fujikawa; Shen Qing; Taro Toyoda; Kenji Yoshino; Shyam S. Pandey; Tingli Ma; Shuzi Shuzi Hayase
ORGANIC PHOTOVOLTAICS XV, 9184, 2014, Peer-reviwed
International conference proceedings, English

Ex Situ CdSe Quantum Dot-Sensitized Solar Cells Employing Inorganic Ligand Exchange To Boost Efficiency
Feng Liu; Jun Zhu; Junfeng Wei; Yi Li; Linhua Hu; Yang Huang; Oshima Takuya; Qing Shen; Taro Toyoda; Bing Zhang; Jianxi Yao; Songyuan Dai
JOURNAL OF PHYSICAL CHEMISTRY C, 118, 1, 214-222, Jan. 2014, Peer-reviwed
Scientific journal, English

All-solid Sn/Pb halide perovskite sensitized solar cells
Yuhei Ogomi; Atsushi Morital; Shota Tsukamotol; Takahiro Saithol; Naotaka Fujikawal; Shen Qing; Taro Toyoda; Kenji Yoshino; Shyam S. Pandeyl; Tingli Mal; Shuzi Hayase
2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), 147-151, 2014
International conference proceedings, English

Effect of electrolyte constituents on the motion of ionic species and recombination kinetics in dye-sensitized solar cells
Shota Kuwahara; Soichiro Taya; Naoya Osada; Qing Shen; Taro Toyoda; Kenji Katayama
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 11, 5242-5249, 2014, Peer-reviwed
Scientific journal, English

Photoexcited carrier dynamics of double-layered CdS/CdSe quantum dot sensitized solar cells measured by heterodyne transient grating and transient absorption methods
N. Osada; T. Oshima; S. Kuwahara; T. Toyoda; Q. Shen; K. Katayama
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 12, 5774-5778, 2014, Peer-reviwed
Scientific journal, English

Role of lithium and co-existing cations in electrolyte to improve performance of dye-sensitized solar cells
Soichiro Taya; Shota Kuwahara; Qing Shen; Taro Toyoda; Kenji Katayama
RSC ADVANCES, 4, 41, 21517-21520, 2014, Peer-reviwed
Scientific journal, English

Multiple exciton generation in cluster-free alloy CdxHg1-xTe colloidal quantum dots synthesized in water
Stephen V. Kershaw; Sergii Kalytchuk; Olga Zhovtiuk; Qing Shen; Takuya Oshima; Witoon Yindeesuk; Taro Toyoda; Andrey L. Rogach
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 47, 25710-25722, 2014, Peer-reviwed, Invited
Scientific journal, English

Charge transfer and recombination at the metal oxide/CH3NH3PbClI2/spiro-OMeTAD interfaces: uncovering the detailed mechanism behind high efficiency solar cells
Qing Shen; Yuhei Ogomi; Jin Chang; Syota Tsukamoto; Kenji Kukihara; Takuya Oshima; Naoya Osada; Kenji Yoshino; Kenji Katayama; Taro Toyoda; Shuzi Hayase
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 37, 19984-19992, 2014, Peer-reviwed
Scientific journal, English

Influence of linker molecules on interfacial electron transfer and photovoltaic performance of quantum dot sensitized solar cells
Junwei Yang; Takuya Oshima; Witoon Yindeesuk; Zhenxiao Pan; Xinhua Zhong; Qing Shen
JOURNAL OF MATERIALS CHEMISTRY A, 2, 48, 20882-20888, 2014, Peer-reviwed
Scientific journal, English

Optical absorption of CdSe quantum dots on electrodes with different morphology
Witoon Yindeesuk; Qing Shen; Shuzi Hayase; Taro Toyoda
AIP ADVANCES, 3, 10, Oct. 2013
Scientific journal, English

Optical absorption of CdSe quantum dots on electrodes with different morphology
Witoon Yindeesuk; Qing Shen; Shuzi Hayase; Taro Toyoda
AIP ADVANCES, 3, 10, 1021115-1021119, Oct. 2013, Peer-reviwed
Scientific journal, English

Ultrafast characterization of the electron injection from CdSe quantum dots and dye N719 co-sensitizers into TiO2 using sulfide based ionic liquid for enhanced long term stability
Victoria Gonzalez-Pedro; Qing Shen; Vasko Jovanovski; Sixto Gimenez; Ramon Tena-Zaera; Taro Toyoda; Ivan Mora-Sero
ELECTROCHIMICA ACTA, 100, 35-43, Jun. 2013, Peer-reviwed
Scientific journal, English

先進理工学科における2年次専門実験（電気・電子回路実験）の準備と実施について
奥野剛史; 大家明広; 山崎典昌; 高橋光生; 早川義彦; 矢崎和幸; 和田紀子; 藁科崇; 坂本克好; Choo Cheow Keong; 永井豊; 守屋雅隆; 沈青; 島田宏; 林茂雄
電気通信大学紀要 vol25, no1 (2013.2) pp.73-78, 25, 1, 73-78, Feb. 2013, Peer-reviwed
Research institution, Japanese

High performance PbS Quantum Dot Sensitized Solar Cells exceeding 4% efficiency: the role of metal precursors in the electron injection and charge separation
Victoria Gonzalez-Pedro; Cornelia Sima; Gabriela Marzari; Pablo P. Boix; Sixto Gimenez; Qing Shen; Thomas Dittrich; Ivan Mora-Sero
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 33, 13835-13843, 2013, Peer-reviwed
Scientific journal, English

Dye sensitized solar cells consisting of metallophthalocyanine axially anchored on metal oxide nanoparticles through metal-O-metal linkages-difference in photovoltaic performances between TiO2 and SnO2 electrode
B. Park; Q. Shen; Y. Ogomi; S. S. Pandey; T. Toyoda; S. Hyayse
ECS J. Solid State Sci. Technol., Vol. 2,, Q6-Q11, Jan. 2013, Peer-reviwed
Scientific journal, English

Detection of non-absorbing charge dynamics via refractive index change in dye-sensitized solar cells
Shota Kuwahara; Hiroaki Hata; Soichiro Taya; Naotaka Maeda; Qing Shen; Taro Toyoda; Kenji Katayama
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 16, 5975-5981, 2013, Peer-reviwed
Scientific journal, English

Carrier dynamics in quantum-dot sensitized solar cells measured by transient grating and transient absorption methods
Naotaka Maeda; Hiroaki Hata; Naoya Osada; Qing Shen; Taro Toyoda; Shota Kuwahara; Kenji Katayama
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 26, 11006-11013, 2013, Peer-reviwed
Scientific journal, English

Huge suppression of charge recombination in P3HT-ZnO organic-inorganic hybrid solar cells by locating dyes at the ZnO/P3HT interfaces
Qing Shen; Yuhei Ogomi; Sandeep K. Das; Shyam S. Pandey; Kenji Yoshino; Kenji Katayama; Hisayo Momose; Taro Toyoda; Shuzi Hayase
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15, 34, 14370-14376, 2013, Peer-reviwed
Scientific journal, English

Photovoltaics and photoexcited carrier dynamics of double-layered CdS/CdSe quantum dot-sensitized solar cells
T. Toyoda; Y. Onishi; K. Katayama; T. Sawada; S. Hayase; Q. Shen
J. Mater. Sci. Eng. A&B, 3, 601-608, 2013, Peer-reviwed
Scientific journal, English

Relationship between the catalytic activity of Pt/alumina and the relaxation process of the photoexcited electrons
J. Ito; Y. Hanaki; Q. Shen; T. Toyoda
Appl. Surf. Sci., 268, 230-235, Nov. 2012, Peer-reviwed
Scientific journal, English

Quantum-Dot-Sensitized Solar Cells: Effect of Nanostructured TiO2 Morphologies on Photovoltaic Properties
Taro Toyoda; Qing Shen
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 3, 14, 1885-1893, Jul. 2012, Peer-reviwed
Scientific journal, English

Effect of nanostructured electrode architecture and semiconductor deposition strategy on the photovoltaic performance of quantum dot sensitized solar cells
Mahmoud Samadpour; Sixto Gimenez; Pablo P. Boix; Qing Shen; Mauricio E. Calvo; Nima Taghavinia; Azam Iraji Zad; Taro Toyoda; Hernan Miguez; Ivan Mora-Sero
ELECTROCHIMICA ACTA, 75, 139-147, Jul. 2012, Peer-reviwed
Scientific journal, English

Ultrafast carrier dynamics in PbS quantum dots
Qing Shen; Kenji Katayama; Tsuguo Sawada; Sojiro Hachiya; Taro Toyoda
CHEMICAL PHYSICS LETTERS, 542, 89-93, Jul. 2012, Peer-reviwed
Scientific journal, English

Effect of ZnS coatings on the enhancement of the photovoltaic properties of PbS quantum dot-sensitized solar cells
Sojiro Hachiya; Qing Shen; Taro Toyoda
JOURNAL OF APPLIED PHYSICS, 111, 10, 104315 - 104315-4, May 2012, Peer-reviwed
Scientific journal, English

Characterization of Photoexcited Carriers and Thermal Properties of Nanoparticulate TiO2 Film Using Heterodyne Transient Grating Method
Hiroaki Hata; Kenji Katayama; Qing Shen; Taro Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 4, 042601, Apr. 2012, Peer-reviwed
Scientific journal, English

Semiconductor quantum dot-sensitized solar cells employing TiO2 nanostructured photoanodes with different morphologies
Qing Shen; Taro Toyoda
Quantum Dot Devices, Springer New York, 317-350, 01 Jan. 2012, Peer-reviwed
In book, English

Multiple electron injection dynamics in linearly-linked two dye co-sensitized nanocrystalline metal oxide electrodes for dye-sensitized solar cells
Qing Shen; Yuhei Ogomi; Byung-wook Park; Takafumi Inoue; Shyam S. Pandey; Akari Miyamoto; Shinsuke Fujita; Kenji Katayama; Taro Toyoda; Shuzi Hayase
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 14, 13, 4605-4613, 2012, Peer-reviwed
Scientific journal, English

Dependences of the optical absorption and photovoltaic properties of CdS quantum dot-sensitized solar cells on the CdS quantum dot adsorption time
Sojiro Hachiya; Yohei Onishi; Qing Shen; Taro Toyoda
JOURNAL OF APPLIED PHYSICS, 110, 5, 054319-1~5, Sep. 2011, Peer-reviwed
Scientific journal, English

Multiple electron injection from dyes to titania layer for high efficiency-dye-sensitized solar cells
Byung-Wook Park; Kengo Sadamasu; Yuhei Ogomi; Akari Miyamoto; Shinsuke Fujita; Shyam S. Pandey; Qing Shen; Taro Toyoda; Shuzi Hayase
Conference Record of the IEEE Photovoltaic Specialists Conference, 001187-001191, 2011
International conference proceedings, English

A flexible photoelectrode for CdS/CdSe quantum dot-sensitized solar cells (QDSSCs)
Xiaoming Huang; Shuqing Huang; Quanxin Zhang; Xiaozhi Guo; Dongmei Li; Yanhong Luo; Qing Shen; Tara Toyoda; Qingbo Meng
CHEMICAL COMMUNICATIONS, 47, 9, 2664-2666, 2011, Peer-reviwed
Scientific journal, English

Highly efficient CdS/CdSe-sensitized solar cells controlled by the structural properties of compact porous TiO2 photoelectrodes
Quanxin Zhang; Xiaozhi Guo; Xiaoming Huang; Shuqing Huang; Dongmei Li; Yanhong Luo; Qing Shen; Taro Toyoda; Qingbo Meng
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 13, 10, 4659-4667, 2011, Peer-reviwed
Scientific journal, English

Uncovering the role of the ZnS treatment in the performance of quantum dot sensitized solar cells
Nestor Guijarro; Jose M. Campina; Qing Shen; Taro Toyoda; Teresa Lana-Villarreal; Roberto Gomez
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 13, 25, 12024-12032, 2011, Peer-reviwed
Scientific journal, English

Highly efficient quasi-solid-state quantum-dot-sensitized solar cell based on hydrogel electrolytes
Zhexun Yu; Quanxin Zhang; Da Qin; Yanhong Luo; Dongmei Li; Qing Shen; Taro Toyoda; Qingbo Meng
ELECTROCHEMISTRY COMMUNICATIONS, 12, 12, 1776-1779, Dec. 2010
Scientific journal, English

Direct Correlation between Ultrafast Injection and Photoanode Performance in Quantum Dot Sensitized Solar Cells
Nestor Guijarro; Qing Shen; Sixto Gimenez; Ivan Mora-Sero; Juan Bisquert; Teresa Lana-Villarreal; Taro Toyoda; Roberto Gomez
JOURNAL OF PHYSICAL CHEMISTRY C, 114, 50, 22352-22360, Dec. 2010, Peer-reviwed
Scientific journal, English

Photoacoustic and photoelectrochemical current spectra of combined CdS/CdSe quantum dots adsorbed on nanostructured TiO2 electrodes, together with photovoltaic characteristics
Taro Toyoda; Keita Oshikane; Dongmei Li; Yanhong Luo; Qingbo Meng; Qing Shen
JOURNAL OF APPLIED PHYSICS, 108, 11, 114304-1~7, Dec. 2010, Peer-reviwed
Scientific journal, English

Highly efficient quasi-solid-state quantum-dot-sensitized solar cell based on hydrogel electrolytes
Zhexun Yu; Quanxin Zhang; Da Qin; Yanhong Luo; Dongmei Li; Qing Shen; Taro Toyoda; Qingbo Meng
ELECTROCHEMISTRY COMMUNICATIONS, 12, 12, 1776-1779, Dec. 2010, Peer-reviwed
Scientific journal, English

Separation of ultrafast photoexcited electron and hole dynamics in CdSe quantum dots adsorbed onto nanostructured TiO2 films
Qing Shen; Yasumasa Ayuzawa; Kenji Katayama; Tsuguo Sawada; Taro Toyoda
APPLIED PHYSICS LETTERS, 97, 26, 263113-1~3, Dec. 2010, Peer-reviwed
Scientific journal, English

Screen-printed Cu2S-based Counter Electrode for Quantum-dot-sensitized Solar Cell
Minghui Deng; Shuqing Huang; Quanxin Zhang; Dongmei Li; Yanhong Luo; Qing Shen; Taro Toyoda; Qingbo Meng
CHEMISTRY LETTERS, 39, 11, 1168-1170, Nov. 2010, Peer-reviwed
Scientific journal, English

CdSe quantum dot-sensitized solar cell employing TiO2 nanotube working-electrode and Cu2S counter-electrode
Qing Shen; Akari Yamada; Satoru Tamura; Taro Toyoda
APPLIED PHYSICS LETTERS, 97, 12, 123107, Sep. 2010, Peer-reviwed
Scientific journal, English

Fibrous CdS/CdSe quantum dot co-sensitized solar cells based on ordered TiO2 nanotube arrays
Shuqing Huang; Quanxin Zhang; Xiaoming Huang; Xiaozhi Guo; Minghui Deng; Dongmei Li; Yanhong Luo; Qing Shen; Taro Toyoda; Qingbo Meng
NANOTECHNOLOGY, 21, 37, 375201, Sep. 2010, Peer-reviwed
Scientific journal, English

Low-Cost Flexible Nano-Sulfide/Carbon Composite Counter Electrode for Quantum-Dot-Sensitized Solar Cell
Minghui Deng; Quanxin Zhang; Shuqing Huang; Dongmei Li; Yanhong Luo; Qing Shen; Taro Toyoda; Qingbo Meng
NANOSCALE RESEARCH LETTERS, 5, 6, 986-990, Jun. 2010, Peer-reviwed
Scientific journal, English

Sensitization of Titanium Dioxide Photoanodes with Cadmium Selenide Quantum Dots Prepared by SILAR: Photoelectrochemical and Carrier Dynamics Studies
N. Guijarro; T. Lana-Villarreal; Q. Shen; T. Toyoda; R. Gó mez
J. Phys. Chem. C, 114, 21928-21937, May 2010, Peer-reviwed
Scientific journal, English

Comparative study of by near-field heterodyne transient grating and continuously variable spatial frequency transient grating methods for measurements of terahertz reflection responses
H. Inoue; K. Katayama; Q. Shen; T. Toyoda; K. A. Nelson
15TH INTERNATIONAL CONFERENCE ON PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA (ICPPP15), 214, 012123, 2010, Peer-reviwed
International conference proceedings, English

Recombination in Quantum Dot Sensitized Solar Cells
Ivan Mora-Sero; Sixto Gimenez; Francisco Fabregat-Santiago; Roberto Gomez; Qing Shen; Taro Toyoda; Juan Bisquert
ACCOUNTS OF CHEMICAL RESEARCH, 42, 11, 1848-1857, Nov. 2009, Peer-reviwed
Scientific journal, English

Electron dynamics in GaN wafers with an inhomogeneous distribution of defects in the depth direction
Yuji Ohashi; Kenji Katayama; Qing Shen; Taro Toyoda
JOURNAL OF APPLIED PHYSICS, 106, 6, 063515, Sep. 2009, Peer-reviwed
Scientific journal, English

Improving the performance of colloidal quantum-dot-sensitized solar cells
Sixto Gimenez; Ivan Mora-Sero; Lorena Macor; Nestor Guijarro; Teresa Lana-Villarreal; Roberto Gomez; Lina J. Diguna; Qing Shen; Taro Toyoda; Juan Bisquert
NANOTECHNOLOGY, 20, 29, 295204 (1-6), Jul. 2009, Peer-reviwed
Scientific journal, English

Terahertz reflection response measurement using a phonon polariton wave
Hayato Inoue; Kenji Katayama; Qing Shen; Taro Toyoda; Keith A. Nelson
JOURNAL OF APPLIED PHYSICS, 105, 5, 054902, Mar. 2009, Peer-reviwed
Scientific journal, English

Electric Characteristics of Li2O-Doped TiO2 Nanocrystalline Film and Its Application to Dye-Sensitized Solar Cells
Masahiro Nada; Tomohiro Gonda; Qing Shen; Hiroshi Shimada; Taro Toyoda; Naoki Kobayashi
JAPANESE JOURNAL OF APPLIED PHYSICS, 48, 2, 025505, Feb. 2009, Peer-reviwed
Scientific journal, English

Photoacoustic spectra of Au quantum dots adsorbed on nanostructured TiO2 electrodes together with the photoelectrochemical current characteristics
Taro Toyoda; Sae Tsugawa; Qing Shen
JOURNAL OF APPLIED PHYSICS, 105, 3, 034314, Feb. 2009, Peer-reviwed
Scientific journal, English

Room-Temperature Absorption Edge of InGaN/GaN Quantum Wells Characterized by Photoacoustic Measurement
Yosuke Takeda; Daigo Takagi; Tatsuji Sano; Shin Tabata; Naoki Kobayashi; Qing Shen; Taro Toyoda; Jun Yamamoto; Yuzaburo Ban; Kou Matsumoto
JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 12, 8805-8807, Dec. 2008, Peer-reviwed
Scientific journal, English

Characterization of electron transfer from CdSe quantum dots to nanostructured TiO2 electrode using a near-field heterodyne transient grating technique
Qing Shen; Kenji Katayama; Tsuguo Sawada; Taro Toyoda
THIN SOLID FILMS, 516, 17, 5927-5930, Jul. 2008, Peer-reviwed
Scientific journal, English

Effect of ZnS coating on the photovoltaic properties of CdSe quantum dot-sensitized solar cells
Qing Shen; Junya Kobayashi; Lina J. Diguna; Taro Toyoda
JOURNAL OF APPLIED PHYSICS, 103, 8, 084304, Apr. 2008, Peer-reviwed
Scientific journal, English

Correlation between crystal growth and photo sensitization of nanostructured TiO2 electrodes using supporting Ti substrates by self-assembled CdSe quantum dots
Taro Toyoda; Junya Kobayashi; Qing Shen
THIN SOLID FILMS, 516, 9, 2426-2431, Mar. 2008, Peer-reviwed
Scientific journal, English

A device-independent design scheme on interactive animation and game
Li Xin-yu; Song Ying; Huang Xia; Xiang Li-sheng; Shen Qing
WORLD CONGRESS ON ENGINEERING 2008, VOLS I-II, 265-269, 2008
International conference proceedings, English

Generation and detection of tunable phonon polaritons using a single transmission grating
Kenji Katayama; Hayato Inoue; Hisashi Sugiya; Qing Shen; Taro Toyoda; Keith A. Nelson
APPLIED PHYSICS LETTERS, 92, 3, 031906, Jan. 2008, Peer-reviwed
Scientific journal, English

Optical absorption and ultrafast carrier dynamics characterization of CdSe quantum dots deposited on different morphologies of nanostructured TiO2 films
Lina J. Diguna; Qing Shen; Akira Sato; Kenji Katayama; Tsuguo Sawada; Taro Toyoda
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 27, 5-8, 1514-1520, Sep. 2007, Peer-reviwed
Scientific journal, English

Effect of Fe doping on photoluminescence of yttria-stabilized zirconia
H. Nakajima; H. Ishihara; Q. Shen; T. Toyoda; K. Itoh; H. Kaneko; Y. Tamaura
JOURNAL OF ALLOYS AND COMPOUNDS, 441, 1-2, 255-258, Aug. 2007, Peer-reviwed
Scientific journal, English

Crystal growth. of CdSe quantum dots adsorbed on nanoparticle, inverse opal, and nanotube TiO2 photoelectrodes characterized by photoacoustic spectroscopy
Taro Toyoda; Terumasa Uehata; Rihito Suganuma; Satoru Tamura; Akira Sato; Kana Yamamoto; Qing Shen; Naoki Kobayashi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46, 7B, 4616-4621, Jul. 2007, Peer-reviwed
Scientific journal, English

High efficiency of CdSe quantum-dot-sensitized TiO2 inverse opal solar cells
Lina J. Diguna; Qing Shen; Junya Kobayashi; Taro Toyoda
APPLIED PHYSICS LETTERS, 91, 2, 023116, Jul. 2007, Peer-reviwed
Scientific journal, English

Optical absorption, photosensitization, and ultrafast carrier dynamic investigations of CdSe quantum dots grafted onto nanostructured SnO2 electrode and fluorine-doped tin oxide (FTO) glass
Qing Shen; Makoto Yanai; Kenji Katayama; Tsuguo Sawada; Taro Toyoda
CHEMICAL PHYSICS LETTERS, 442, 1-3, 89-96, Jul. 2007, Peer-reviwed
Scientific journal, English

Phonon polariton generation and detection using near-field heterodyne transient grating method
Kenji Katayama; Qing Shen; Taro Toyoda; Keith A. Nelson
APPLIED PHYSICS LETTERS, 90, 17, 171117, Apr. 2007, Peer-reviwed
Scientific journal, English

Characterization of carrier dynamics in semiconductor nanomaterials using near-field heterodyne transient grating method
Q. Shen; K. Katayama; T. Sawada; T. Toyoda
MICROPROCESSES AND NANOTECHNOLOGY 2007, DIGEST OF PAPERS, 34-+, 2007, Peer-reviwed
International conference proceedings, English

Carrier dynamics in porous silicon studied with a near-field heterodyne transient grating method
Masahiro Yamaguchi; Kenji Katayama; Qing Shen; Taro Toyoda; Tsuguo Sawada
CHEMICAL PHYSICS LETTERS, 427, 1-3, 192-196, Aug. 2006, Peer-reviwed
Scientific journal, English

Optical absorption, photoelectrochemical, and ultrafast carrier dynamic investigations of TiO2 electrodes composed of nanotubes and nanowires sensitized with CdSe quantum dots
Qing Shen; Kenji Katayama; Tsuguo Sawada; Masahiro Yamaguchi; Taro Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 45, 6B, 5569-5574, Jun. 2006, Peer-reviwed
Scientific journal, English

Photoacoustic and photoelectrochemical characterization of inverse opal TiO2 sensitized with CdSe quantum dots
Lina J. Diguna; Motonobu Murakami; Akira Sato; Yuki Kumagai; Taishi Ishihara; Naoki Kobayashi; Qing Shen; Taro Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 45, 6B, 5563-5568, Jun. 2006, Peer-reviwed
Scientific journal, English

The effect of ultraviolet irradiation on the photothermal, photo luminescence and photo luminescence excitation spectra of Mn-doped ZnS nanoparticles
AB Cruz; Q Shen; T Toyoda
THIN SOLID FILMS, 499, 1-2, 104-109, Mar. 2006, Peer-reviwed
Scientific journal, English

The influence of chemical post-etching and UV irradiation on the optical absorption and thermal diffusivity of porous silicon studied by photoacoustic technique
Q Shen; M Inoguchi; T Toyoda
THIN SOLID FILMS, 499, 1-2, 161-167, Mar. 2006, Peer-reviwed
Scientific journal, English

Photoacoustic and photo electrochemical characterization of CdSe-sensitized TiO2 electrodes composed of nanotubes and nanowires
Q Shen; T Sato; M Hashimoto; CC Chen; T Toyoda
THIN SOLID FILMS, 499, 1-2, 299-305, Mar. 2006, Peer-reviwed
Scientific journal, English

Photoexcited hole dynamics in TiO2 nanocrystalline films characterized using a lens-free heterodyne detection transient grating technique
Q Shen; K Katayama; T Sawada; M Yamaguchi; Y Kumagai; T Toyoda
CHEMICAL PHYSICS LETTERS, 419, 4-6, 464-468, Feb. 2006, Peer-reviwed
Scientific journal, English

Studies on the effect of UV irradiation on Mn-doped ZnS nanoparticles
AB Cruz; Q Shen; T Toyoda
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 25, 5-8, 761-765, Dec. 2005, Peer-reviwed
Scientific journal, English

Effect of rutile-type content on nanostructured anatase-type TiO2 electrode sensitized with CdSe quantum dots characterized with photoacoustic and photoelectrochemical current spectroscopies
T Toyoda; Tsuboya, I; Q Shen
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 25, 5-8, 853-857, Dec. 2005, Peer-reviwed
Scientific journal, English

Study of ultrafast carrier dynamics of nanostructured TiO2 films with and without CdSe quantum dot deposition using lens-free heterodyne detection transient grating technique
Q Shen; K Katayama; M Yamaguchi; T Sawada; T Toyoda
THIN SOLID FILMS, 486, 1-2, 15-19, Aug. 2005, Peer-reviwed
Scientific journal, English

Lens-free heterodyne transient grating technique
K Katayama; Q Shen; T Toyoda; M Yamaguchi; T Sawada
JOURNAL DE PHYSIQUE IV, 125, 349-353, Jun. 2005, Peer-reviwed
Scientific journal, English

Photoluminescence study of mixtures of anatase and rutile TiO2 nanoparticles: Influence of charge transfer between the nanoparticles on their photo luminescence excitation bands
H Nakajima; T Mori; Q Shen; T Toyoda
CHEMICAL PHYSICS LETTERS, 409, 1-3, 81-84, Jun. 2005, Peer-reviwed
Scientific journal, English

Photoacoustic and photoluminescence characterization of passivated and unpassivated Mn-doped ZnS nanoparticles
AB Cruz; Q Shen; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44, 6B, 4354-4357, Jun. 2005, Peer-reviwed
Scientific journal, English

Photoacoustic and photoelectrochemical characterization of CdSe quantum dots grafted onto fluorine-doped tin oxide (FTO) substrate
T Toyoda; D Arae; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44, 6B, 4465-4468, Jun. 2005, Peer-reviwed
Scientific journal, English

Effect of ligand carboxylation on adsorption and photosensitization in Ru(II)-complex dye-sensitized nanocrystalline TiO(2) solar cell
T Ishihara; J Tokue; T Sano; Q Shen; T Toyoda; N Kobayashi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44, 4B, 2780-2782, Apr. 2005, Peer-reviwed
Scientific journal, English

Optical absorption, photoelectrochemical, and ultrafast carrier dynamic investigations of CdSe quantum dot sensitized TiO2 electrodes composed of nanotubes and nanowires
Q. Shen; K. Katayama; M. Yamaguchi; T. Sawada; K. Sato; T. Toyoda
Digest of Papers - Microprocesses and Nanotechnology 2005: 2005 International Microprocesses and Nanotechnology Conference, 2005, 184-185, 2005
International conference proceedings, English

Effect of rutile-type content on optical absorption and photoelectrochemical properties of nanostructured anatase-type TiO2 electrodes sensitized with CdSe quantum dots
H. Otsuka; Q. Shen; T. Toyoda
Digest of Papers - Microprocesses and Nanotechnology 2005: 2005 International Microprocesses and Nanotechnology Conference, 2005, 182-183, 2005
International conference proceedings, English

Synthesis and characterization of nano honeycomb TiO2 electrodes
L. J. Diguna; M. Murakami; A. Sato; Y. Kumagai; T. Ishihara; N. Kobayashi; Q. Shen; T. Toyoda
Digest of Papers - Microprocesses and Nanotechnology 2005: 2005 International Microprocesses and Nanotechnology Conference, 2005, 96-97, 2005
International conference proceedings, English

Carrier dynamics of anatase and rutile TiO2 nanostructured electrodes adsorbed with CdSe quantum dots
Qing Shen; Yoki Kumagai; Kenji Katayama; Masahiro Yamaguchi; Tsuguo Sawada; Taro Toyoda
IQEC, International Quantum Electronics Conference Proceedings, 2005, 781-782, 2005, Peer-reviwed
International conference proceedings, English

Effect of UV exposure on the photoluminescence characteristics of nanocrystalline Mn-doped ZnS
Almira B. Cruz; Shen Qing; Taro Toyoda
IQEC, International Quantum Electronics Conference Proceedings, 2005, 777-778, 2005, Peer-reviwed
International conference proceedings, English

Photoexcited carrier dynamic characterization of TiO2 electrodes composed of different size mixture of nanoparticles sensitized with CdSe quantum dots
Taro Toyoda; Yuki Kumagai; Qing Shen; Masahiro Yamaguchi; Tsuguo Sawada; Kenji Katayama
IQEC, International Quantum Electronics Conference Proceedings, 2005, 253-254, 2005, Peer-reviwed
International conference proceedings, English

Photosensitization of nanostructured TiO2 with CdSe quantum dots: effects of microstructure and electron transport in TiO2 substrates
Q Shen; D Arae; T Toyoda
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 164, 1-3, 75-80, Jun. 2004
Scientific journal, English

Characterization of nanostructured TiO2 electrodes sensitized with CdSe quantum dots using photoacoustic and photoelectrochemical current methods
Q Shen; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 43, 5B, 2946-2951, May 2004
Scientific journal, English

Studies of optical absorption and electron transport in nanocrystalline TiO2 electrodes
Q Shen; T Toyoda
THIN SOLID FILMS, 438, 167-170, Aug. 2003
Scientific journal, English

Photoacoustic and photoelectrochemical current response of nanostructured TiO2 electrodes
T Toyoda; M Hayashi; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 42, 5B, 3036-3040, May 2003
Scientific journal, English

Effect of sensitization by quantum-sized CdS on photoacoustic and photoelectrochemical current spectra of porous TiO2 electrodes
T Toyoda; J Sato; Q Shen
REVIEW OF SCIENTIFIC INSTRUMENTS, 74, 1, 297-299, Jan. 2003, Peer-reviwed
Scientific journal, English

Photoacoustic spectroscopy of CdTe nanocrystals doped in a GeO2 glass matrix.
I.Tsuboya; D.Arae; Q.Shen; T.Toyoda
Review of Scientific Instruments, 74, 792, Jan. 2003, Peer-reviwed
Scientific journal, English

Mn ion concentration dependence of the photoacoustic and photoluminescence spectra of ZnS:Mn nanocrystals.
T.Toyoda; J.Matsuzawa; A.B.Cruz; Q.Shen
Review of Scientific Instruments, 74, 793, Jan. 2003, Peer-reviwed
Scientific journal, English

Exposure time dependence of the photoacoustic and photoluminescence intensities of porous silicon with different wavelengths of excitation light
T Toyoda; T Yamazaki; Q Shen
REVIEW OF SCIENTIFIC INSTRUMENTS, 74, 1, 869-871, Jan. 2003, Peer-reviwed
Scientific journal, English

Dependence of thermal conductivity of porous silicon on porosity characterized by photoacoustic technique
Q Shen; T Toyoda
REVIEW OF SCIENTIFIC INSTRUMENTS, 74, 1, 601-603, Jan. 2003
Scientific journal, English

Effect of sensitization by quantum-sized CdS on photoacoustic and photoelectrochemical current spectra of porous TiO2 electrodes
T Toyoda; J Sato; Q Shen
REVIEW OF SCIENTIFIC INSTRUMENTS, 74, 1, 297-299, Jan. 2003
Scientific journal, English

Photoacoustic Spectroscopy of CdTe Nanocrystals Doped in GeO2 Glass Matrix
I. Tsuboya; D. Arae; Q. Shen; T. Toyoda
Rev. Sci. Instrum., 74, 792, 2003
Scientific journal, English

Mn Ion Concentration Dependence of the Photoacoustic and Photoluminescence Spectra of ZnS:Mn Nanocrystals
T. Toyoda; J. Matsuzawa; A. B. Cruz; Q. Shen
Rev. Sci. Instrum., 74, 793, 2003
Scientific journal, English

Pressure dependence of Brillouin scattering spectra in semiconductors CdSxSe1-x doped glasses.
Y.Takagi; N.Sato; Q.Shen; T.Toyoda
Journal of Non-Crystalline Solids, 307-310, 785-789, Dec. 2002, Peer-reviwed
Scientific journal, English

Porosity dependence of thermal conductivity for porous silicon characterized by photoaccoustic technique.
Q.Shen; T.Toyoda
Proceedings of the International Workshop on Modern Science and Technology, 79-82, Sep. 2002
International conference proceedings, English

Pressure dependence of Brillouin scattering spectra in semiconductors CdSxSe1-x doped glasses
Y Takagi; N Sato; Q Shen; T Toyoda
JOURNAL OF NON-CRYSTALLINE SOLIDS, 307, 785-789, Sep. 2002
Scientific journal, English

Photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO2 films fabricated with different applied voltage treatments
T Toyoda; M Hayashi; J Sato; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 5B, 3367-3370, May 2002, Peer-reviwed
Scientific journal, English

Photoacoustic and photoluminescence spectra of ZnS : Mn nanocrystals
T Toyoda; J Matsuzawa; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 5B, 3383-3386, May 2002, Peer-reviwed
Scientific journal, English

Effect of size confinement on CdSe nanocrystals in a GeO2 glass matrix characterized by photoacoustic spectroscopy
T Toyoda; D Arae; Q Shen
PHYSICA B-CONDENSED MATTER, 316, 476-478, May 2002, Peer-reviwed
Scientific journal, English

Effect of size confinement on CdSe nanocrystals in a GeO2 glass matrix characterized by photoacoustic spectroscopy
T Toyoda; D Arae; Q Shen
PHYSICA B-CONDENSED MATTER, 316, 476-478, May 2002
Scientific journal, English

Photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO2 films fabricated with different applied voltage treatments
T Toyoda; M Hayashi; J Sato; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 5B, 3367-3370, May 2002
Scientific journal, English

Photoacoustic and photoluminescence spectra of ZnS : Mn nanocrystals
T Toyoda; J Matsuzawa; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 5B, 3383-3386, May 2002
Scientific journal, English

Photothermal characterization of highly porous, polycrystalline TiO2 electrodes fabricated by chemical synthesis
T Toyoda; M Hayashi; J Sato; Q Shen
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 69, 3, 1037-1044, 2002, Peer-reviwed
Scientific journal, English

Characterization of thermal properties of porous silicon film/silicon using photoacoustic technique
Q Shen; T Toyoda
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 69, 3, 1067-1073, 2002, Peer-reviwed
Scientific journal, English

Pressure Dependence of Brillouin Scattering Spectra in Semiconductors CdSxSe1-x doped glasses
Y. Takagi; N. Sato; Q. Shen; T. Taro
J. Non-crystalline Solids, 307-310, 785-789, 2002
Scientific journal, English

Effect of Voltage Treatment on the Photoacoustic and Photoelectrochemical Current Spectra of Highly Porous, Polycrystalline TiO2 electrodes
J. Sato; M. Hayashi; Q. Shen; T. Toyoda
Anal. Sci., 17, i1153-i1155, 2002
Scientific journal, English

Photoacoustic Spectra of CdSe Nanocrystals in a GeO2 Glass Matrix
D. Arae; Q. Shen; T. Toyoda
Anal. Sci., 17, i1149-i1152, 2002
Scientific journal

Photothermal characterization of highly porous, polycrystalline TiO2 electrodes fabricated by chemical synthesis
T Toyoda; M Hayashi; J Sato; Q Shen
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 69, 3, 1037-1044, 2002
Scientific journal, English

Characterization of thermal properties of porous silicon film/silicon using photoacoustic technique
Q. Shen; T. Toyoda
Journal of Thermal Analysis and Calorimetry, 69, 3, 1067-1073, 2002
Scientific journal, English

Photoacoustic spectra of mixed TiO2 ultrafine powders with rutile and anatase structures
T Toyoda; R Taira; Q Shen; M Ohmori
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 40, 5B, 3587-3590, May 2001
Scientific journal, English

ZnOセラミックス中のCo不純物の光音響スペクトル
豊田太郎; 海野 誠; 沈 青
電子情報通信学会技術研究報告, The Institute of Electronics, Information and Communication Engineers, 100, 640, 17-22, 2001, Photoacoustic(PA) spectroscopy is applied to study the optical absorption of ZnO ceramics doped with 0-2.0 mol% CoO impurities sintered at 1200℃. PA spectroscopy is useful for scattering materials such as ceramics to get the optical absorption characteristics. Both of PA intensity and phase spectra showed the optical absorption peaks by Co impurities which were interpreted in terms of the inner transition of the(3d)^7 electrons in Co^<2+>(crystal field splitting). These signal intensities increase linearly with the increase of Co impurities at the low concentration region. At higher concentration region, they showed the constant values. These nonlinearlity of the PA intensities suggest the increase of magnetic interaction between Co impurities, and, hence, the PA intensities are saturated with the increase of Co impurities.
Japanese

Effect of size confinement on CdSe nanocrystals in a GeO_2_ glass matrix characterized by photoacoustic spectroscopy
T. Toyoda; D. Arae; T. Iio; Q. Shen
Extended Abstracts of the 4th NIMC International Symposium on Photoreaction Control and Photofunctional Materials, 238-239, 2001
English

Optical absorption characteristics and modulation frequency dependence of the photoelectrochemical current spectra of highly porous，polycrystalline TiO_2_ electrodes
T. Toyoda; J. Sato; Q. Shen
Extended Abstracts of the 4th NIMC International Symposium on Photoreaction Control and Photofunctional Materials, 240-241, 2001
English

Influence of anodization period on the photoacoustic spectra of poros silicon
T. Toyoda; R. Torai; Q. Shen
Extended Abstracts of the 4th NIMC International Symposium on Photoreaction Control and Photofunctional Materials, 242-243, 2001
English

Photoacoustic spectra of mixed TiO_2_ ultrfine powders with rutile and anatase types
T. Toyoda; R. Taira; Q. Shen
Extended Abstracts of the 4th NIMC International Symposium on Photoreaction Control and Photofunctional Materials, 244-245, 2001
English

ポーラスSiの光音響スペクトルの陽極化成電流時間依存性
虎井礼司; 沈 青; 豊田太郎
第48回応用物理学関係連合講演会講演予稿集, 812, 2001
Japanese

光音響分光法によるGeO_2_ガラス中に分散したCdSeナノクリスタル野評価
新江 大; 沈 青; 豊田太郎
第48回応用物理学関係連合講演会講演予稿集, 1419, 2001
Japanese

フラクタル状ポーラスTiO_2_電極の光吸収と光電流スペクトルの変調周波数依存性
佐藤 淳; 沈 青; 豊田太郎
第48回応用物理学関係連合講演会講演予稿集, 1420, 2001
Japanese

ルチル型とアナターゼ型のTiO_2_混合微粒子系の光音響法による評価
豊田太郎; 平 梨恵; 沈 青
第48回応用物理学関係連合講演会講演予稿集, 1420, 2001
Japanese

透過型光音響分光法による半導体の熱物性と電子物性の評価
沈 青; 豊田太郎
熱物性, 15, 15-22, 2001
Japanese

Photoacoustic spectra of mixed ceramics of Al2O3 and Cr2O3
T Toyoda; H Yamamoto; M Togashi; Q Shen
ANALYTICAL SCIENCES, 17, S43-S46, 2001
Scientific journal, English

Photoacoustic spectra of low-dimensional magnet of VOMoO4
T Toyoda; Q Shen; Shiozaki, I
ANALYTICAL SCIENCES, 17, S47-S49, 2001
Scientific journal, English

Ultrafast dynamics of CdSxSe1-x nanocrystals doped in glasses studied by ultrafast transient lensing effect
Q Shen; T Toyoda; Y Hirose; K Katayama; H Yui; M Fujinami; T Sawada; A Harata
ANALYTICAL SCIENCES, 17, S241-S244, 2001
Scientific journal, English

Effect of size confinement on photoacoustic spectra and photothermal response of CdSxSe1-x (0 <= x <= 1) nanocrystals in a glass matrix
T Toyoda; Q Shen
ANALYTICAL SCIENCES, 17, S259-S261, 2001
Scientific journal, English

Characterization of optical and thermal properties of porous silicon using photoacoustic technique
Q Shen; T Takahashi; T Toyoda
ANALYTICAL SCIENCES, 17, S281-S283, 2001
Scientific journal, English

Effect of voltage treatment on modulation frequency dependence of the photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO2 electrodes
T. Toyoda; J. Sato; Q. Shen
Jpn. J. Appl. Phys., The Japan Society of Applied Physics, 40, 5, 3853-3856, 2001, We report the effect of voltage on a concentrated KCl electrolyte applied to a highly porous TiO₂ electrode during its final preparation process on the photoelectrochemical current (PEC) spectra. Optical absorption measurements were monitored by a photoacoustic (PA) method. The PA spectrum of the TiO₂ electrode with the voltage treatment is similar to that without the treatment above the band-gap region. Below the band-gap region, the intensities of the PA spectrum of the TiO₂ electrode with the voltage treatment are higher than those without the treatment, suggesting an increase of carrier concentration by the voltage treatment. The PEC spectra without the voltage treatment show a monotonic increase with the photon energy above the band-gap region. The PEC intensity with the voltage treatment increases rapidly immediately above the band-gap region and shows saturated values. The PEC intensity of the TiO₂ electrode with the voltage treatment is approximately twice that without the treatment above the band-gap region. The increase of the PEC intensity implies an increase of carrier concentration due to partially reduced Ti ions. The modulation frequency dependence of the PEC intensity of TiO₂ electrodes with and without the voltage treatment shows two types of exponential decay. The decay rate in the TiO₂ electrode with the voltage treatment is slower than that without the treatment below the modulation frequency of 100 Hz. The decay rate with the voltage treatment agrees with that without the treatment above the modulation frequency of 100 Hz.
English

ポーラスSiの光音響スペクトルと蛍光スペクトルに及ぼす化学エッチング効果
豊田太郎; 高橋徹治; 沈 青
日本分光学会平成13年度春季講演会講演要旨集, 60, 2001
Japanese

Photo-acoustic spectra of CdSe nanocrystals in a GeO2 glass matrix
T. Toyoda; D. Arae; Q. Shen
Abstracts of the International Congress on Analytical Sciences 2001, 277, 2001
English

Effect of voltage treatments on the photoacoustic and photoelectrochemical current spectra highly porous, polycrystalline TiO2 electrodes
T. Toyoda; J. Sato; Q. Shen
Abstracts of the International Congress on Analytical Sciences 2001, 277, 2001
English

Photo- acoustic and photoluminescence spectra of porous silicon with different anodization period
T. Toyoda; R. Torai; Q. Shen
Abstracts of the International Congress on Analytical Science 2001, 278, 2001
English

Influence of anodization period on the photoacoustic spectra of porous silicon
T. Toyoda; R. Torai; Q. Shen
Abstracts of the 10th International Conference on Phonon Scattering in Condensed Matter, 216, 2001
English

Effect of size confinement on CdSe nanocrystals in a GeO2 glass matrix characterized by photoacoustic spectroscopy
T. Toyoda; D. Arae; Q. Shen
Abstracts of the 10th International Conference on Phonon Scattering in Condensed Matter, 218, 2001
English

ポーラスSiの光吸収と発光の時間依存性
虎井礼司; 沈 青; 豊田太郎
第62回応用物理学会学術講演会講演予稿集, 1076, 2001
Japanese

フラクタル状TiO2膜の光音響スペクトル
佐藤 淳; 林 雅; 沈 青; 豊田太郎
第62回応用物理学会学術講演会講演予稿集, 1082, 2001
Japanese

Photoacoustic, photoelectrochemical current, and photoluminescence spectra of highly porous, polycrystalline TiO2 electrodes fabricated by chemical synthesis
Taro Toyoda; Tomoya Hayakawa; Qing Shen
Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Elsevier Sequoia SA, 78, 2-3, 84-89, 15 Dec. 2000
Scientific journal, English

Photoacoustic, photoelectrochemical current, and photoluminescence spectra of highly porous, polycrystalline TiO2 electrodes fabricated by chemical synthesis
T Toyoda; T Hayakawa; Q Shen
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 78, 2-3, 84-89, Dec. 2000
Scientific journal, English

Photoacoustic and photoluminescence studies of porous silicon etched by low-concentration hydrofluoric acid
T Toyoda; T Takahashi; Q Shen
JOURNAL OF APPLIED PHYSICS, 88, 11, 6444-6450, Dec. 2000
Scientific journal, English

Photoluminescence and photoacoustic investigations of the photodarkening effect in CdSxSe1-x nanocrystal-doped glasses
Q Shen; K Abe; T Shigenari; T Toyoda
JOURNAL OF LUMINESCENCE, 87-9, 444-446, May 2000
Scientific journal, English

Photoacoustic and photoluminescence characterization of highly porous, polycrystalline TiO2 electrodes made by chemical synthesis
T Toyoda; T Hayakawa; K Abe; T Shigenari; Q Shen
JOURNAL OF LUMINESCENCE, 87-9, 1237-1239, May 2000
Scientific journal, English

Photoacoustic characterization of thermal and electronic transport properties of CdInGaS4 in a transmission detection configuration
Q Shen; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 39, 5B, 3164-3168, May 2000
Scientific journal, English

Characterization of electronic states of TiO2 powders by photoacoustic spectroscopy
T Toyoda; H Kawano; Q Shen; A Kotera; M Ohmori
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 39, 5B, 3160-3163, May 2000
Scientific journal, English

Dependence of the photoacoustic signal intensity on modulation frequency for CdInGaS4 crystals under a transmission detection configuration
Q Shen; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 39, 2A, 511-512, Feb. 2000
Scientific journal, English

Photoacoustic, Electrochemical Photocurrent, and Photoluminescence Spectra of Highly Porous, Polycrystalline TiO_2_ electrodes Fabricated by Chemical Synthesis
T. Toyoda; T. Hayakawa; Q. Shen
Extended Abstracts of the 3rd NIMC International Symposium on Photoreaction Control and Phtofunctional Materials, 256-257, 2000
English

Characterization of Electronic States for TiO_2_ Powders by Photoacoustic Spectroscopy
T. Toyoda; H. Kawano; Q. Shen; A. Kotera; M. Ohmori
Extended Abstracts of the 3rd NIMC International Symposium on Photoreaction Control and Photofunctional Materials, 258-259, 2000
English

CdSeをドープしたGeO_2_ガラスの作製と光音響分光法による評価
沈 青; 飯尾能将; 豊田太郎
第47回応用物理学関係連合講演会講演予稿集, 1366, 2000
Japanese

Al_2_O_3_とCr_2_O_3_との結晶セラミックスの光音響スペクトル
豊田太郎; 山本洋秀; 富樫昌美; 沈 青
第47回応用物理学関係連合講演会講演予稿集, 1366, 2000
Japanese

TiO_2_膜の光音響ならびにフォトルミネッセンススペクトルに及ぼす電圧印加処理効果
豊田太郎; 早川智也; 沈 青
第47回応用物理学関係連合講演会講演予稿集, 1366, 2000
Japanese

TiO_2_膜の光音響ならびに光電流スペクトルに及ぼす電圧印加処理効果
豊田太郎; 早川智也; 沈 青
第47回応用物理学関係連合講演会講演予稿集, 1367, 2000
Japanese

Modulation Frequency Dependence of the Photoacoustic Signal Intensities for Multinary Compound CdInGaS4 with a DC Electric Field
Taro Toyoda; Masamichi Yamamuro; Qing Shen
JAPANESE JOURNAL OF APPLIED PHYSICS, 39, 1, 457-458, 2000
Scientific journal, English

Modulation Frequency Dependences of Photoacoustic Signal Intensity and Phase for CdInGaS4
Qing Shen; Taro Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS, 39, 1, 459-460, 2000
Scientific journal, English

Brillouin scattering of glasses doped with semiconductors CdS_x_Se_1-x_
Y. Takagi; N. Sato; Q. Shen; T. Toyoda
Trans. Mater. Res. Sco. Jpn., 25, 951-954, 2000
English

Effect of size confinement on photoacoustic spectra and photothermal response of CdS_x_Se_1-x_（0≦x≦1）nanocrystals in a glass matrix
T. Toyoda; Q. Shen
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, A-26-p1, 2000
English

Effect of chemical etching on photoacoustic and photocurrent spectra of highly porous, polycrystalline TiO_2_ electrodes,
T. Toyoda; T. Hayakawa; H. Kawano; Q. Shen
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, A-26-p4, 2000
English

Photoacoustic spectra of mixed ceramics of Al_2_O_3_ and Cr_2_O_3_
T. Toyoda; H. Yamamoto; M. Togashi; Q. Shen
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, P-01-11, 2000
English

Photoacoustic spectra of low-demensional magnet of VOMoO_4_
T. Toyoda; Q. Shen; I. Shiozaki
Abstracts of the 11th International Conference on Photoacoustic and Photohermal Phenomena, P-01-12, 2000
English

Photoacoustic studies of thermal and electronic properties of CdInGaS_4_
Q. Shen; T. Toyoda
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, P-03-25, 2000
English

Photoacoustic and photolmminescence studies of porous silicon etched by low-concentration HF
T. Toyoda; T. Takahashi; M. Yammamuro; Q. Shen
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, P-06-12, 2000
English

Chracterization of thermal and electronic properties of porous silicon using photoacoustic technique
Q. Shen; T. Takahashi; T. Toyoda
Abstracts of the 11th International Conference on Photoacoustic and Photothermal Phenomena, P-06-14, 2000
English

ポーラス化TiO_2_電極の，光音響ならびに光電流スペクトルに及ぼす電圧印加処理効果
豊田太郎; 早川智也; 河野 寛; 沈 青
第8回「高効率太陽電池および太陽光発電システム」ワークショップ予稿集, 155-158, 2000
Japanese

Chracterization of thermal and electronic properties of CdInGaS_4_ by photoacoustic technique
Q. Shen; T. Toyoda
Abstracts Book of the 1st Asian Conference on Crystal Growth and Crystal Technology, 427, 2000
English

Photoacoustic spectra of CdSe nenocrystals grown in a GeO_2_ glass mitrix
T. Toyoda; Q. Shen
Abstracts Book of the 1st Asian Conference on Crystal Growth and Crystal Technology, 428, 2000
English

Optical absorption characterization of low-dimensional magnet of VOMoO_4_ by photoacoustic spectroscopy
T. Toyoda; Q. Shen; I. Shiozaki
Abstracts Book of the 1st Asian Conference on Crystal Growth and Crystal Technology, 497, 2000
English

Effect of size confinement on ultrafast relaxation dynamics of CdS_x_Se_1-x_（x=0.26） nanocrystals in a glass matrix investigated by ultrafast lensing effect
T. Toyoda; Q. Shen; Y. Hirose; K. Katayama; M. Fujinami; T. Sawada; A. Harata
Abstracts of the 25th International Conference on the Physics of Semiconductors, 535, 2000
English

光音響法によるルチル型成分含有率の異なるTiO_2_微粒子の評価
豊田太郎; 平 梨恵; 河野 寛; 沈 青; 大森将弘
第21回日本熱物性シンポジウム講演論文集, 138-140, 2000
Japanese

光音響法によるポーラスシリコンの熱物性評価
沈 青; 高橋徹治; 豊田太郎
第21回日本熱物性シンポジウム講演論文集, 157-159, 2000
Japanese

Dependence of the photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO_2_ electrodes on mudulation frequency
J. Sato; Q. Shen; T. Toyoda
Conference Digest of the 8th International Workshop on Modern Acoustics-NDE, 86, 2000
English

Photoacoustic spectra of mixed TiO_2_ powders with rutile and anatase types
R. Taira; Q. Shen; T. Toyoda
Conference Digest of the 8th International Workshop on Modern Acoustics-NDE, 87, 2000
English

Photoacoustic spectra of CdS nanocrystals in a GeO_2_ glass matrix
D. Arae; Q. Shen; T. Toyoda
Conference Digest of the 8th International Workshop on Modern Acoustics-NDE, 88, 2000
English

Photoacoustic spectra of ternarhy and multinary semiconducting compound CdIn_2_S_4_ with different stoichiometric ratio
N. Nakajima; T. Takizawa; Q. Shen; T. Toyoda
Conference Digest of the 8th International Workshop on Modern Acoustics-NDE, 89, 2000
English

フラクタル状ポーラス化TiO_2_膜の光音響・光電流スペクトル変調周波数依存性
佐藤 淳; 沈 青; 豊田太郎
第21回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 109-110, 2000
Japanese

ルチル型とアナターゼ型のTiO_2_混合微粒子系の光音響スペクトル
豊田太郎; 平 梨恵; 沈 青
第21回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 111-112, 2000
Japanese

Brilouin Scattering of Glasses Doped with Semiconducters CdS_x_Se_1-x_
Yasunari Takagi; Naoko Sato; Qing Shen; Taro Toyoda
第11回日本MRS学術シンポジウム予稿集，（KSP 神戸サイエンスパーク）, 221, Dec. 1999
English

半導体（CdS_x_Se_1-x_）ドープガラスの顕微ブリルアン散乱
佐藤真子; 高木康成; 沈 青; 豊田太郎
日本物理学会講演概要集４，（岩手大), 620, Sep. 1999
Japanese

Photoacoustic studies of annealed CdSxSe1-x (x=0.26) nanocrystals in a glass matrix
Q Shen; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 38, 5B, 3163-3167, May 1999
Scientific journal, English

Photoacoustic and photocurrent studies of highly porous TiO2 electrodes sensitized by quantum-sized CdS
T Toyoda; K Saikusa; Q Shen
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 38, 5B, 3185-3186, May 1999
Scientific journal, English

CdS_x_Se_1-x_（x＝0.26）ドープガラスの光音響スペクトル
豊田太郎; 沈 青
電子情報通信学会技術研究報告（超音波）, US98-1～9, 23-28, Apr. 1999
Japanese

光音響を用いた，ポーラス化TiO_2_に吸着したCdSナノクリスタルの評価
豊田太郎; 七種耕治; 沈 青
日本音響学会1999年春季研究発表講演論文集, 1999, 1, 819-820, Mar. 1999
Japanese

光音響分光法によるCdInGaS_4_電子輸送と熱物性の評価
沈 青; 豊田太郎
第46回応用物理学会連合講演会講演予稿集, 1342, Mar. 1999
Japanese

光音響分光法によるphotodarkeningしたCdS_x_Se_1-x_ドープガラスの評価
沈 青; 豊田太郎
第46回応用物理学会連合講演会講演予稿集, 1342, Mar. 1999
Japanese

フラクタル化多結晶TiO_2_の光音響ならびに光電流スペクトル
早川智也; 沈 青; 豊田太郎
第46回応用物理学会連合講演会講演予稿集, 1343, Mar. 1999
Japanese

Photoacoustic spectra of CdInGaS4 with a dc electric field
T Toyoda; M Yamamuro; Q Shen
PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA, 463, 274-276, 1999
International conference proceedings, English

Photoacoustic spectroscopy of annealed CdSxSe1-x (x = 0.26) nanocrystal doped glasses
Q Shen; T Toyoda
PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA, 463, 494-496, 1999
International conference proceedings, English

Photothermal applications of lasers: Study of fast and ultrafast photothermal phenomena at metal-liquid interfaces
A Harata; Q Shen; T Sawada
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 50, 193-219, 1999
English

ポーラスSiの光音響スペクトルと発光特性
高橋 徹治; 山室正倫; 沈 青; 豊田太郎
電子情報通信学会技術研究報告（超音波）, The Institute of Electronics, Information and Communication Engineers, 99, 32, 7-12, 1999, Porous silicon,which can be prepared by electrochemical method on the Si surface, shows photoluminesoence in visible region at room temperature. So it has attracted much attention for application to optical devices. Although the optical absorption properties are very important for basic and applied studies,these properties can not be measured using the conventional method because of the light scattering and the opaque substrate. It is well known that photoacoustic (PA) method is useful for studying the optical absorption on those samples. In this work, the chemical etching effects of porous silicon are studied using photoacoustic, photoluminescence (PL) and photoluminescence excitation (PLE) methods. The PA signal intensity above the fundamental absorption edge of porous silicon with chemical etching is smaller than that without etching, indicating the larger fluorescence quantum efficiency in porous silicon with chemical etching than that without etching.
Japanese

光音響法による四元化合物半導体CdInGaS_4_の電子物性と熱物性の評価
沈 青; 豊田太郎
電子情報通信学会技術研究報告（超音波）, 99, 132, 9-14, 1999
Japanese

光音響法によるポーラス化フラクタル状TiO_2_の電圧印加処理の評価
豊田太郎; 早川智也; 沈 青
電子情報通信学会技術研究報告（超音波）, The Institute of Electronics, Information and Communication Engineers, 99, 132, 15-20, 1999, TiO_2 is one of the candidates for photoanode materials that split water in solar energy conversion cells because of its high chemical and photoelectrochemical durability. In order to increase solar energy conversion efficiency, the preparation of highly porous, polycrystalline TiO_2 to increase surface area by chemical synthesis has been proposed. In the present paper, we report the optical absorption spectra by photoacousric (PA) method of the materials to show the effect of applying voltage in electrolyte for final preparation processes. Although the PA spectrum of TiO_2 with applying voltage treatments is similar to that wihout the treatments above the band gap, the former below the band gap shows larger singal intensities than the latter, indicating the possibility of the formation of defect states by applying voltage treatments.
Japanese

Photoluminescence and Photoacoustic Study on Laser-Induced Darkening in CdS_x_Se_1-x_ Nanocrystal-Doped Glasses
Q. Shen; K. Abe; T. Shigenari; T. Toyoda
Collected Abstracts of the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, 122, 1999
English

Photoacoustic and Photoluminescence Characterization of Highly Porous, Polycrystalline TiO_2_ electrodes made by Chemical Synthesis
T. Toyoda; T. Hayakawa; K. Abe; T. Shigenari; Q. Shen
Collected Abstracts of the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, 176, 1999
English

Influence of Chemical Etching for Porous Silicon on Photoacoustic, Photoluminescence, and Photoluminescence Excitation Spectra
T. Toyoda; T. Takahashi; M. Yamamuro; K. Abe; T. Shigenari; Q. Shen
Collected Abstracts of the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, 224, 1999
English

Nonradiative Character of Ceramic Al_2-x_Cr_x_O_3_（0.002＜■.―.x＜■.―.1.0）by Means of Photoacoustic Measurements
T. Toyoda; M. Togashi; Q. Shen
Collected Abstracts of the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, 248, 1999
English

Photothermal Investigation of CdS_x_Se_1-x_（x＝0.26）Nanocrystals in a Glass Matrix（Annealing and Temperature Effect）
T. Toyoda; Q. Shen
Abstracts of the 15th European Conference on Thermophysical Properties, 324, 1999
English

Photothermal Investigation of Highly Porous, Polycrystalline TiO_2_ electrodes
T. Toyoda; T. Hayakawa; Q. Shen
Abstracts of the 15th European Conference on Thermophysical Properties, 325, 1999
English

Photothermal Investigation of P-Type Si with an Apllied DC-Electric Field
T. Toyoda; M. Ishida; T. Takahashi; Q. Shen
Abstracts of the 15th European Conference on Thermophysical Properties, 326, 1999
English

化学エッチングしたポーラスシリコンの発光と光音響スペクトル
高橋徹治; 沈 青; 豊田太郎
第60回応用物理学会学術講演会講演予稿集, 658, 1999
Japanese

光音響分光法によるCdInGaS_4_の電子物性と熱物性の評価（Ⅱ）
沈 青; 豊田太郎
第60回応用物理学会学術講演会講演予稿集, 658, 1999
Japanese

光音響法によるTiO_2_微粒子の評価
豊田太郎; 河野 寛; 沈 青; 小寺昭彦; 大森将弘
第20回日本熱物性シンポジウム講演論文集, 70-73, 1999
Japanese

光音響法によるポーラス化TiO_2_とその表面に吸着したCdSナノクリスタルの評価
豊田太郎; 七種耕治; 早川智也; 沈 青
第20回日本熱物性シンポジウム講演論文集, 74-77, 1999
Japanese

光音響分光法によるCdInGaS_4_の熱物性と電子物性の評価
沈 青; 豊田太郎
第20回日本熱物性シンポジウム講演論文集, 94-97, 1999
Japanese

CdSSe系ドープガラスの光音響スペクトル（アニール温度依存性）
沈 青; 飯尾能将; 豊田太郎
第20回日本熱物性シンポジウム講演論文集, 98-101, 1999
Japanese

ポーラスシリコンの光音響スペクトル
高橋徹治; 沈 青; 豊田太郎
第20回日本熱物性シンポジウム講演論文集, 106-109, 1999
Japanese

Al_2_O_3_とCr_2_O_3_との結晶セラミックスの光音響スペクトル
豊田太郎; 山本洋秀; 富樫昌美; 沈 青
第20回日本熱物性シンポジウム講演論文集, 110-113, 1999
Japanese

Al_2_O_3_とCr_2_O_3_との結晶セラミックスの光音響スペクトルと発光特性
豊田太郎; 山本洋秀; 高橋徹治; 沈 青
第19回電子材料研究討論会講演論文集, 62, 1999
Japanese

ポーラス化TiO_2_膜の光音響法による電子状態評価
豊田太郎; 早川智也; 河野 寛; 沈 青
第19回電子材料研究討論会講演論文集, 63, 1999
Japanese

TiO_2_微粒子の光音響スペクトル
豊田太郎; 河野 寛; 沈 青; 小寺昭彦; 大森将弘
第20回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 91-91, 1999
Japanese

透過型光音響法による CdInGaS_4_の熱物性と電子物性の評価
沈 青; 豊田太郎
第20回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 93-94, 1999
Japanese

ガラス中のCdS_x_Se_1-x_（x＝0.26）マイクロクラスター粒径変化が光音響スペクトルに及ぼす効果
沈 青; 豊田太郎
第19回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 59-60, Nov. 1998
Japanese

溶液成長によるCdS薄膜と，ポーラス化TiO_2_に吸着したCdSナノクリスタルの光音響スペクトル
豊田太郎; 七種耕治; 山室正倫; 沈 青
第19回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集, 141-142, Nov. 1998
Japanese

Detection of photoinduced electronic, thermal, and acoustic dynamics of gold film using a transient reflecting grating method under three types of surface plasmon resonance conditions
K Katayama; T Sawada; Q Shen; A Harata
PHYSICAL REVIEW B, 58, 13, 8428-8436, Oct. 1998
Scientific journal, English

CdS微粒子を吸着したポーラス化TiO_2_の光音響ならびに光電流スペクトル
豊田太郎; 七種耕治; 沈 青
第18回電子材料研究討論会講演予稿集, 69-70, Oct. 1998
Japanese

CdSSe系ドープガラスの光音響スペクトル
沈 青; 豊田太郎
第18回電子材料研究討論会講演予稿集, 71-72, Oct. 1998
Japanese

CdSSe系ドープガラスの光音響スペクトル（アニール時間依存性）
島本 聡; 沈 青
第59回応用物理学会学術講演会講演予稿集, 1141, Sep. 1998
Japanese

CdS微粒子を吸着したポーラス化TiO_2_の光音響ならびに光電流スペクトル
豊田太郎; 七種耕治; 沈 青
第59回応用物理学会学術講演会講演予稿集, 1141, Sep. 1998
Japanese

Photoacoustic spectra of CdS_x_Se_1-x_（x＝0.26）nanocrystals in a glas matrix
T. Toyoda; Q. Shen
Abstracts of the Oji International Seminar on Photothermal Phenomena and Their Applications (invited), 26-33, Aug. 1998
English

Analysis of thim films and solid-liquid interfaces using picosecond transient reflecting grating technique
Q. Shen; A. Harata; T. Sawada
Oji International Seminar on Photothermal and Their Applications (invited), 80-87, Aug. 1998
English

Photoacoustic spectra of CdInGaS_4_ with a dc electric field
T. Toyoda; M. Yamamuro; Q. Shen
Abstracts of the 10th International Conference on Photoacoustic and Photothermal Phenomena, 205-206, Aug. 1998
English

Photoacoustic studies annealed GdSxSe1-x（x＝0.26）nanocrystals in a glass matrix
Q. Shen; T. Toyoda
Abstracts of the 10th International Conference on Photoacoustic and Photothermal Phenomena, 391-392, Aug. 1998
English

Detection of Photo-Induced Electronic, Thermal and Acoustic Dynamics of a Gold Film Using a Transient Reflecting Grating Method under Three Types of Surace Plasmon Resonance Conditions
Kenji KATAYAMA; Tsuguo SAWADA; Qing SHEN; and Akira HARATA
Physical Review B, 58, 13, 8428-8436, 1998, True
English

Photoacoustic and photoluminescence studies of CdSxSe1-x doped glasses
Q Shen; Y Kato; T Toyoda
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 36, 5B, 3297-3299, May 1997, Peer-reviwed
Scientific journal, English

Hypersonic investigation of electrochemical interfaces
A Harata; Q Shen; T Sawada
PHYSICA B-CONDENSED MATTER, 219-20, 629-631, Apr. 1996, Peer-reviwed
Scientific journal, English

Theory of transient reflecting grating in fluid/metallic thin film/substrate systems for thin film characterization and electrochemical investigation
Q Shen; A Harata; T Sawada
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 35, 4A, 2339-2349, Apr. 1996, Peer-reviwed
Scientific journal, English

Enhancement of transient reflecting grating amplitude under surface plasmon resonance
Q Shen; K Katayama; A Harata; T Sawada
9TH INTERNATIONAL CONFERENCE ON PHOTOACOUSTIC AND PHOTOTHERMAL PHENOMENA, CONFERENCE DIGEST, 345-346, 1996, Peer-reviwed
International conference proceedings, English

Theoretical and experimental analyses of transient reflecting grating (TRG) generation and detection of hypersonic longitudinal waves
Q Shen; A Harata; T Sawada
ACUSTICA, 82, S207-S207, Jan. 1996, Peer-reviwed
Scientific journal, English

ANALYSIS OF ION-IMPLANTED DIAMOND-LIKE-CARBON FILMS USING LASER-INDUCED TRANSIENT REFLECTING GRATING TECHNIQUE
Q SHEN; A HARATA; T SAWADA
JOURNAL DE PHYSIQUE IV, 4, C7, 233-236, Jul. 1994, Peer-reviwed
Scientific journal, English

TRANSIENT REFLECTING GRATING STUDY OF ION-IMPLANTED SEMICONDUCTORS
A HARATA; H NISHIMURA; Q SHEN; T TANAKA; T SAWADA
JOURNAL DE PHYSIQUE IV, 4, C7, 159-162, Jul. 1994, Peer-reviwed
Scientific journal, English

LASER-STIMULATED SCATTERING MICROSCOPE STUDY OF AN ION-IMPLANTED SILICON SURFACE
A HARATA; Q SHEN; T TANAKA; T SAWADA
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 32, 8, 3633-3638, Aug. 1993, Peer-reviwed
Scientific journal, English

Super narrow bandgap (<1.2 eV) halide double perovskites: Recent advancements and future perspectives
Jeong Yeon Lee; Padmini Pandey; Seojun Lee; Qing Shen; Dong Won Kang
01 Jul. 2024, Chemical Engineering Journal, 491, Book review, 1385-8947, 85192492672

Resilient Women and the Resiliency of Science
Niveen M. Khashab; Sara E. Skrabalak; Lihi Adler-Abramovich; Stacey F. Bent; Fedwa El-Mellouhi; Eugenia Kumacheva; Delia J. Milliron; Jennifer Neu; Elham Rezasoltani; Qing Shen; Sabrina Sicolo
American Chemical Society, 14 Sep. 2021, Chemistry of Materials, 33, 17, 6585-6588, English, Book review, 1520-5002, 85114613597

State-of-the-Art Progress in Diverse Black Phosphorus-Based Structures: Basic Properties, Synthesis, Stability, Photo- and Electrocatalysis-Driven Energy Conversion
Wa Gao; Yong Zhou; Xinglong Wu; Qing Shen; Jinhua Ye; Zhigang Zou
Wiley-VCH Verlag, 01 Jan. 2021, Advanced Functional Materials, 31, 3, English, Book review, 1616-3028, 85091181349

Quantum dot size dependence of the photoexcited carrier dynamics in PbS quantum dot film
小栗直己; 朝倉良太; DING C.; 早瀬修二; 豊田太郎; SHEN Q.
2021, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 68th, 202102240201278386

Optical Properties and Photoexcited Carrier Dynamics and Stability of APbBr₃ Perovskite NCs
矢嶋祥太; 川畑健太郎; LIU Feng; ZHANG Yaohong; DING Chao; 豊田太郎; 早瀬修二; SHEN Qing
2021, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 68th, 202102247523145609

Synthesis of CsSn_xPb_1-xI₃ Perovskite QDs and Their Optical Properties
矢嶋祥太; DING Chao; 豊田太郎; 早瀬修二; SHEN Qing
2021, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 82nd, 202202231973950590

Improvement of conversion efficiency of Tin perovskite solar cells by Multi-anion substitution
西村滉平; KAMARUDIN Muhammad Akmal; SHEN Qing; 飯久保智; 峯元高志; 吉野賢二; 早瀬修二
2021, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 82nd, 202202232355408872

Photoexcited carrier dynamics of PbS/CdS quantum dots film
小栗直己; DING C.; 早瀬修二; 曽我部東馬; 豊田太郎; SHEN Q.
2021, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 82nd, 202202261214535291

Improvement of conversion efficiency for tin perovskite solar cells using bromide substitution
西村滉平; KAMARUDIN Muhammad Akmal; SHEN Qing; 飯久保智; 峯元高志; 吉野賢二; 早瀬修二
2021, 電気化学秋季大会講演要旨集(CD-ROM), 2021, 202202211209742915

Standardization of Perovskite Films Deposition Process by in-situ Observation
廣谷太佑; 濱田健吾; KAMARUDIN Akmal; QING Shen; 豊田太郎; 早瀬修二
2020, 日本化学会春季年会講演予稿集(CD-ROM), 100th, 202002289223150806

Improvement of conversion efficiency of SnGe-perovskite solar cell by ethylammonium substitution
西村滉平; KAMARUDIN Muhammad Akmal; 廣谷太佑; 濱田健吾; 飯久保智; SHEN Qing; 峯元高志; 吉野賢二; 早瀬修二; 早瀬修二
2020, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 67th, 202002236244675829

Optical Absorption of PbS Quantum Dots with Ligands on Single Crystal TiO₂-Comparative Study of Photoacoustic and Absorbance Spectroscopies-
豊田太郎; SHEN Qing; 中澤直樹; 吉原泰葉; 神山慶太; 早瀬修二
2020, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 67th, 202002282074647284

Photoexcited carrier dynamics of PbS/CdS core-shell quantum dots
小栗直己; DING C.; 吉田康二; ZHANG Y.; 早瀬修二; 豊田太郎; SHEN Qing
2020, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 67th, 202002287919157664

Conversion Efficiency Improvement of SnGe-perovskite Solar Cells by Ethylammonium Substitution
西村滉平; KAMARYDIN Muhamad Akmal; 廣谷太佑; 濱田健吾; SHEN Qing; 飯久保智; 峯元高志; 吉野賢二; 早瀬修二; 早瀬修二
2020, 電気化学会大会講演要旨集(CD-ROM), 87th, 202002229326764906

Dependence of the optical properties and carrier dynamics of CsSn_xPb_1-xBr₃ Perovskite nanocrytal on the ratio of tin to lead
川畑健大朗; LIU Feng; ZHANG Yaohong; DING Chao; 豊田太郎; 早瀬修二; SHEN Qing
2020, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 81st, 202102241986403657

Efficiency improvement of Sn-perovskite solar cells by A-site multicationization
西村滉平; KAMARUDIN Muhammad Akmal; 廣谷太佑; 濱田健吾; 飯久保智; SHEN Qing; 峯元高志; 吉野賢二; 早瀬修二; 早瀬修二
2020, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 81st, 202102276707607187

Relationship between Built-in Potential and Open-circuit Voltage in Tin-based Perovskite Solar Cells
廣谷太佑; KAMARUDIN Muhammad Akmal; 西村滉平; SHEN Qing; 豊田太郎; 早瀬修二
2020, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 81st, 202102283659058140

Micro-scale current path distributions of Zn 1-x Mg x O-coated SnO 2 :F transparent electrodes prepared by sol-gel and sputtering methods in perovskite solar cells
Jakapan Chantana; Teruaki Hirayama; Chao Ding; Yu Kawano; Qing Shen; Kenji Yoshino; Shuzi Hayase; Takashi Minemoto
01 Jan. 2019, Thin Solid Films, 669, 455-460, 0040-6090, 85056826714

異なるTiO₂結晶面に吸着した半導体量子ドットの光吸収とUrbach則-光熱変換法と吸光度法による評価-
豊田太郎; SHEN Qing; 神山慶太; 早瀬修二
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902218315783788

Aサイト置換によるSn-Perovskite太陽電池特性と結晶歪みの相関
西村滉平; 廣谷太佑; KAMARUDIN Muhammad Akmal; 飯久保智; SHEN Qing; 豊田太郎; 峯元高志; 吉野賢二; 早瀬修二
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902238899556452

TiO₂単結晶基板上にPbS量子ドット間距離を制御吸着した系の光音響法と光電子収量法による評価:量子ドット増感系
豊田太郎; SHEN Qing; 中澤直樹; 吉原泰葉; 神山慶太; 早瀬修二
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902256643166828

PbS量子ドット薄膜における光励起キャリアダイナミクス-量子ドットサイズの依存性-
北畠有紀子; 北畠有紀子; 大図修平; DING C.; ZHANG Y.; 豊田太郎; 早瀬修二; 片山建二; SHEN Q.
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902268098357964

界面パッシベーションによるPbS量子ドット/ZnOナノワイヤヘテロ接合太陽電池の開放電圧の向上
中村眞子; DING C.; 大図修平; 吉田康二; 吉原泰葉; 豊田太郎; 早瀬修二; SHEN Q.
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902237334555263

逆オパール構造TiO₂光電極を用いたSb₂S₃固体型増感太陽電池
吉原泰葉; 豊田太郎; 早瀬修二; SHEN Qing
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902269007839710

CsSn_xPb_1-xBr₃ペロブスカイト量子ドットの合成と光学的特性
川畑健大朗; LIU Feng; 安田寛啓; 吉田康二; 豊田太郎; 早瀬修二; SHEN Qing
2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th, 201902280478540183

塗布型Pb-ペロブスカイトの半導体特性と太陽電池性能評価
廣谷太佑; 前田優太; SUDHIR Pandey Shyam; QING Shen; 豊田太郎; 峯元高志; 吉野賢二; 早瀬修二; 早瀬修二
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902235770180479

相安定性を持つCsSn_xPb_1-xBr₃ペロブスカイト量子ドットの光学的特性
川畑健大朗; LIU Feng; ZHANG Yaohong; DING Chao; 豊田太郎; 早瀬修二; SHEN Qing
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902273298371572

界面パッシベーションによるPbS量子ドット/ZnOナノワイヤーヘテロ接合太陽電池の電荷再結合の抑制
中村眞子; DIMG C.; 豊田太郎; 早瀬修二; SHEN Q.
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902285143814962

Silver Bismuth Halideを用いた鉛フリー太陽電池の研究
濱田健吾; 廣谷太佑; 西村滉平; KAMARUDIN Muhammad Akmal; SHEN Qing; 豊田太郎; MA Tingli; 早瀬修二
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902220327459540

Sn-ペロブスカイト太陽電池の保管による結晶歪みと変換効率の関係
西村滉平; KAMARUDIN Munammad Akmal; 廣谷太佑; 濱田健吾; 飯久保智; SHEN Qing; 豊田太郎; 峯元高志; 吉野賢二; 早瀬修二; 早瀬修二
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902283093521769

FAPbI₃ペロブスカイトナノ結晶の光学特性と半導体基板への光励起電子の移動ダイナミクス
LIN X.; DING C.; ZHANG Y.; LIU F.; CHANTANA Jakapan; 峯元高志; 豊田太郎; 早瀬修二; SHEN Q.
2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th, 201902232394378132

異なるTiO₂結晶面に吸着した半導体量子ドットの光吸収とUrbach則:光熱変換法と吸光度法による評価
豊田太郎; SHEN Qing; 神山慶太; 早瀬修二
2019, 光化学討論会要旨集(CD-ROM), 2019, 201902256188578166

ルチル型TiO₂単結晶に吸着したPbS量子ドットの結晶成長と電子構造
豊田太郎; SHEN Qing; 堀奏江; 中澤直樹; 神山慶太; 早瀬修二
2018, ナノ学会大会講演予稿集, 16th, 201902218891602106

ペロブスカイト太陽電池における電荷分離・電荷再結合ダイナミックスと光電変換特性との相関 (特集 ペロブスカイト太陽電池の概観と最前線)
沈 青; 尾込 裕平; 豊田 太郎; 吉野 賢二; 早瀬 修二
応用物理学会有機分子・バイオエレクトロニクス分科会, Nov. 2016, Molecular electronics and bioelectronics = 応用物理学会,有機分子・バイオエレクトロニクス分科会会誌, 27, 4, 263-266, Japanese, 2423-8805, 40021070563, AN10464559

Charge Separation, Recombination and the Mechanism of Improvement in Photovoltaic Properties in Perovskite Solar Cells
沈 青; 尾込 裕平; 豊田 太郎; 吉野 賢二; 早瀬 修二
シーエムシー出版, Jul. 2015, ファインケミカル : 調査・資料・報道・抄録, 44, 7, 26-33, Japanese, 0913-6150, 40021171781, AN00015672

Non-vacuum Process of CuInS2 Thin Films From Metal Xanthate Precursors
Mochihara Akiko; Yoshino Kenji; Kawano Minobu; Ogomi Yuhei; Pandey Shyam S.; Shen Qing; Toyoda Taro; Hayase Shuzi
Miyazaki University, 31 Jul. 2014, Memoirs of the Faculty of Engineering, Miyazaki University, 43, 81-84, Japanese, 0540-4924, 110009817985, AA00732558

3P1-2 Photoacoustic Spectroscopy of TiO_2 Nanotube Electrode Adsorbed with CdSe Quantum Dots(Poster Session)
Akimoto Masaya; Shen Qing; Hayase Shuji; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 20 Nov. 2013, Proceedings of Symposium on Ultrasonic Electronics, 34, 415-416, English, 1348-8236, 110009847177, AA1240726X

2P1-9 Photoacoustic characterization of CdSe quantum dots adsorbed on different morphologies of nanostructured TiO_2 for photovoltaic applications(Poster Session)
Yindeesuk Witoon; Akimoto Masaya; Tai Daiki; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 13 Nov. 2012, Proceedings of Symposium on Ultrasonic Electronics, 33, 165-166, English, 1348-8236, 110009619784, AA1240726X

Photoacoustic Spectra of Self-Assembled TiO_2 Nanotube Electrodes by Anodic Oxidation
OTA Tomoka; YAMADA Akari; SHEN Qing; TOYODA Taro
Dye-sensitized solar cells (DSSCs) have attracted much interest as a next generation solar cell. Conventional DSSCs are composed of working electrode made from TiO_2 nanoparticles. Studies on several nanostructured TiO_2 electrodes are in progress. One-dimensional structures of TiO_2such as nanowires and nanotubes are useful for transporting electrons to the substrates. In this study, we prepared self-assembled TiO_2 nanotube (NT) films on Ti substrates using an electrochemical anodizing method. We characterize the optical absorption of TiO_2 NTs by using a photoacoustic (PA) technique. The PA technique is able to measure optical absorption properties for opaque samples., The Institute of Electronics, Information and Communication Engineers, 21 Apr. 2011, IEICE technical report, 111, 21, 35-39, Japanese, 0913-5685, 110008688761, AN1001290X

1Pa-7 Photoacoustic Characterization of Porous Zinc Oxide Thin Films(Poster Session)
Yamada Shuzo; Hosono Eiji; Zhou Haoshen; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 06 Dec. 2010, Proceedings of Symposium on Ultrasonic Electronics, 31, 29-30, English, 1348-8236, 110008149768, AA1240726X

1Pa-6 Photoacoustic and Photoelectrochemical Characterization of Nanostructures TiO_2 Electrode Adsorbed with PbS Quantum Dots(Poster Session)
Hachiya Sojiro; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 06 Dec. 2010, Proceedings of Symposium on Ultrasonic Electronics, 31, 27-28, English, 1348-8236, 110008149767, AA1240726X

1Pa-5 Photoacoustic Spectra of Self-Assembled TiO_2 Nanotube Electrodes by Anodic Oxidation(Poster Session)
Yamada Akari; Ota Tomoka; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 06 Dec. 2010, Proceedings of Symposium on Ultrasonic Electronics, 31, 25-26, English, 1348-8236, 110008149766, AA1240726X

2P2-20 Application of photoacoustic technique for Characterization of thermal diffusivities of nanostructured TiO_2 films(Poster Session)
Nin Tomohiro; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 18 Nov. 2009, Proceedings of Symposium on Ultrasonic Electronics, 30, 263-264, English, 1348-8236, 110007721692, AA1240726X

1J1-2 Characterization of thermal properties of porous Si film adsorbed with CdSe quantum dots using photoacoustic technique(Ultrasonic properties of materials, Phonon physics)
Kogakura Jun; Kato Yushi; Shen Qing; Toyoda Taro
A strong interest has been attracted on nanocrystalline Si (NSi) since it was found to show efficient luminescence at room temperature. In addition, NSi has the thermal conductivity much smaller than that of Si. Therefore, the NSi has been expected to be applied to light emitting devices, thermal insulators, and optical devices. But there are few reports about the thermal property of NSi. In particular, the mechanism of thermal conductive process in the NSi adsorbed with molecules and/or quantum dots is not clear. In this paper, we report our experimental results on the measurements of thermal properties of NSi film adsorbed with CdSe quantum dots using photoacousic technique., Steering committee of symposium on ultrasonic electronics, 11 Nov. 2008, Proceedings of Symposium on Ultrasonic Electronics, 29, 3-4, Japanese, 1348-8236, 110007459278, AA1240726X

Photoacoustic and Photoelectrochemical current spectra of TiO_2 Nanotube Electrodes prepared with Anodic oxidation
TAMURA Satoru; YAMADA Akari; SHEN Qing; TOYODA Taro
08 Oct. 2008, Thermophysical properties, 29, 137-139, Japanese, 0911-1743, 10024651201, AN10370091

Characterization of thermal properties of porous Si film adsorbed with CdSe quantum dots using photoacoustic technique
KOGAKURA Jun; KATO Yushi; SHEN Qing; TOYODA Taro
08 Oct. 2008, Thermophysical properties, 29, 149-151, Japanese, 0911-1743, 10024651238, AN10370091

PHOTOACOUSTIC AND ULTRAFAST CARRIER DYNAMICS OF Au QUANTUM DOTS GRAFTED ONTO NANOSTRUCTURED TiO_2 ELECTRODES
SHEN Qing; SUGANUMA Rihito; KATAYAMA Kenji; SAWADA Tsuguo; TOYODA Taro
08 Oct. 2008, Thermophysical properties, 29, 140-142, Japanese, 0911-1743, 10024651208, AN10370091

PHOTOACOUSTIC AND REFLECTION SPECTRA OF TiO_2 INVERSE OPAL ELECTRODES ADSORBED WITH CdSe QUANTUM DOTS
DIGUNA Lina Jaya; AYUZAWA Yasumasa; SHEN Qing; TOYODA Taro
08 Oct. 2008, Thermophysical properties, 29, 152-154, English, 0911-1743, 10024651246, AN10370091

Characterization of thermal properties of porous Si film adsorbed with CdSe quantum dots using photoacoustic technique
KOGAKURA Jun; KATO Yushi; SHEN Qing; TOYODA Taro
A strong interest has been attracted on porous Si (PSi) since it was found to show efficient luminescence at room temperature. In addition, PSi has the thermal conductivity much smaller than that of Si. Therefore, the PSi has been expected to be applied to light emitting devices, thermal insulators, and optical devices. But there are few reports about the thermal property of PSi. In particular, the mechanism of thermal conductive process in the PSi adsorbed with molecules and/or quantum dots is not clear. In this paper, we report our experimental results on the measurements of thermal properties of PSi film adsorbed with CdSe quantum dots using photoacousic technique., The Institute of Electronics, Information and Communication Engineers, 25 Apr. 2008, IEICE technical report, 108, 19, 5-9, Japanese, 0913-5685, 110006874039, AN1001290X

1-04P-18 Photoacoustic Spectra and Photoexcited Carrier Dynamics of CdSe Quantum Dots Adsorbed on TiO_2 Nanotubes Electrodes(Poster session 1)
Yamamoto K.; Shen Q.; Katayama K.; Sawada T.; Toyoda T.
Steering committee of symposium on ultrasonic electronics, 14 Nov. 2007, Proceedings of Symposium on Ultrasonic Electronics, 28, 51-52, English, 1348-8236, 110007459058, AA1240726X

1-04P-17 Photoacoustic Spectra and Ultrafast Carrier Dynamics of Nanostructured TiO_2 Films Sensitized with CdS Quantum Dots(Poster session 1)
Sato Akira; Shen Qing; Katayama Kenji; Sawada Tsuguo; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 14 Nov. 2007, Proceedings of Symposium on Ultrasonic Electronics, 28, 49-50, English, 1348-8236, 110007459057, AA1240726X

1-04-03 Characterization of Thermal Properties of Nano-crystalline Si Films Using Photoacoustic Technique(Acousto-optics)
Shen Qing; Kato Yusi; Kogakura Jun; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 14 Nov. 2007, Proceedings of Symposium on Ultrasonic Electronics, 28, 11-12, English, 1348-8236, 110007459039, AA1240726X

1-04P-15 Photoacoustic Spectra of Au Quantum Dots Adsorbed on Nanostructured TiO_2 Films(Poster session 1)
Toyoda Taro; Tsugawa Sae; Shen Qing
Steering committee of symposium on ultrasonic electronics, 14 Nov. 2007, Proceedings of Symposium on Ultrasonic Electronics, 28, 45-46, English, 1348-8236, 110007459055, AA1240726X

Photoacoustic and Photoelectrochemical Current Spectra of TiO_2 Nanotube Electrodes Adsorbed with CdSe Quantum Dots
TAMURA Satoru; YAMAMOTO Kana; SHEN Qing; TOYODA Taro
Dye-sensitized solar cells (DSSCs) made from nanostructured TiO_2 electrodes have received considerable attention as future solar cells. The surface morphology optimization of TiO_2 electrodes is one of the factors for improving the DSSCs efficiency. Recently, it was reported that TiO_2 nanotube electrodes show higher short-circuit current than TiO_2 nanoparticle electrodes. This phenomena can be possibly applied for DSSCs to increase photovoltaic conversion efficiency. In this paper, we fabricated the TiO_2 nanotube electrodes, and CdSe quantum dots (QDs) were adsorbed as a sensitizer instead of organic dye. We report the experimental results on optical absorption and electron transfer from CdSe QDs to TiO_2 electrodes by using the photoacoustic (PAS) and incident photon to current conversion efficiency (IPCE) methods, respectively., The Institute of Electronics, Information and Communication Engineers, 23 May 2007, IEICE technical report, 107, 75, 1-4, Japanese, 0913-5685, 110006290582, AN1001290X

P3-38 Photoacoustic and Photoelectrochemical Characterization of CdSe Quantum Dots Grafted onto Fluorine-Doped Tin Oxide (FTO) Glass and Nanostructured SnO_2 Electrode(Poster session 3)
Toyoda Taro; Yanai Makoto; Shen Qing; Katayama Kenji; Sawada Tsuguo
Steering committee of symposium on ultrasonic electronics, 15 Nov. 2006, Proceedings of Symposium on Ultrasonic Electronics, 27, 449-450, English, 1348-8236, 110007458990, AA1240726X

P3-41 Photoacoustic Spectroscopy of CdSe Quantum Dots Adsorbed on Nanostructured TiO_2 Electrode(Poster session 3)
Toyoda Taro; Uehata Terumasa; Shen Qing
Steering committee of symposium on ultrasonic electronics, 15 Nov. 2006, Proceedings of Symposium on Ultrasonic Electronics, 27, 455-456, English, 1348-8236, 110007458993, AA1240726X

Photoacoustic and photoelectrochemical characterization of photonic TiO_2 electrodes sensitized with CdSe quantum dots
SATO Akira; DIGUNA Lina J.; SHEN Qing; ISHIHARA Taishi; KOBAYASHI Naoki; TOYODA Taro
Periodic dielectric arrays with lattice space of the order of wavelengths of light are termed as photonic crystals. Photonic crystals have a property that the group velocity of the specific light becomes small. This phenomena can be possibly applied for dye-sensitized solar cells (DSSC) to increase light harvesting efficiency. In this paper, we fabricated the TiO_2 photonic crystals electrodes, and adsorbed CdSe quantum dots (QDs) on the electrodes as a sensitizer instead of organic dye. We report the experimental results on light absorption and electron transfer from CdSe QDs to TiO_2 electrodes by using the photoacoustic (PA) method and incident photon to current conversion efficiency (IPCE) method, respectively., The Institute of Electronics, Information and Communication Engineers, 19 Apr. 2006, IEICE technical report, 106, 28, 31-34, Japanese, 0913-5685, 110004718814, AN1001290X

J-2 Photoacoustic and Photoelectrochemical Characterization of TiO_2 Nanotube and Nanowire Composite Electrodes Sensitized with CdSe Quantum Dots
Yamamoto Kana; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 16 Nov. 2005, Proceedings of Symposium on Ultrasonic Electronics, 26, 331-332, Japanese, 1348-8236, 110007458684, AA1240726X

P3-66 Photoacoustic and ohotoelectorochemical characterization of nhotonic TiO_2 electrodes sensitized with CdSe quantum dots
Sato Akira; Diguna Lina J.; Murakami Motonobu; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 16 Nov. 2005, Proceedings of Symposium on Ultrasonic Electronics, 26, 471-472, Japanese, 1348-8236, 110007458753, AA1240726X

P3-54 Dependence of HF concentration in anodization process on photoacoustic and photoluminescence spectra
Kumei M.; Inoguchi M.; Toyoda T.; Shen Q.
Steering committee of symposium on ultrasonic electronics, 16 Nov. 2005, Proceedings of Symposium on Ultrasonic Electronics, 26, 447-448, Japanese, 1348-8236, 110007458741, AA1240726X

P3-59 Photoacoustic and photoelectrochemical characterization of CdSe quantum dots grafted onto fluorine-doped tin oxide (FTO) glass and nanostructured SnO_2 electrodes
Yanai Makoto; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 16 Nov. 2005, Proceedings of Symposium on Ultrasonic Electronics, 26, 457-458, Japanese, 1348-8236, 110007458746, AA1240726X

Charactarization of Nanocrystalline Silicon using Photoacoustic Method
INOGUCHI Masashi; SHEN Qing; TOYODA Taro
We applied a photoacoustic (PA) technique to study the optical absorption and thermal diffusivity of nanocrystalline silicon (NSi) samples. The NSi layers were formed on p-type Si wafers in an HF electrolyte. Three kinds of NSi samples that had undergone chemical post-etching were studied before and after UV irradiation for 2 h. We observed that a strong confinement effect occurred in all of the NSi samples from the blue shift of the band gap energy compared with that of crystalline Si, while the effective thermal diffusivities were almost two orders of the magnitude smaller than that of conventional Si crystals. The band gap shifted to higher energy and the effective thermal diffusivity decreased as the post-etching time increased. In the case of a NSi sample that was not chemically post-etched, the optical absorption and effective thermal diffusivity before and after UV irradiation were almost unchanged. However, for the NSi samples that were chemically post-etched, the optical absorption decreased and the effective thermal diffusivity increased after UV irradiation. This indicates that NSi samples that are post-etched are more readily affected by UV irradiation, i.e., oxidized by replacing Si-Hx bonds by Si-Ox, than those that do not undergo post-etching., The Institute of Electronics, Information and Communication Engineers, 06 May 2005, IEICE technical report. Ultrasonics, 105, 44, 13-18, Japanese, 0913-5685, 110003204779, AN1001290X

P2-34 Photoacoustic and Photoluminescence Characterization of Mn-doped ZnS Nanoparticle : Study of UV Irradiation Effect(Short presentation for poster)
Cruz Almira B.; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 27 Oct. 2004, Proceedings of Symposium on Ultrasonic Electronics, 25, 225-226, English, 1348-8236, 110007458396, AA1240726X

P1-48 Photoacoustic and photoelectrochemical characterization of CdSe quantum dots grafted onto fluorine-doped tin oxide (FTO) glass
Toyoda Taro; Arae Dai; Shen Qing
Steering committee of symposium on ultrasonic electronics, 27 Oct. 2004, Proceedings of Symposium on Ultrasonic Electronics, 25, 107-108, Japanese, 1348-8236, 110007458338, AA1240726X

P1-47 Photoacoustic and Photoelectrochemical Current Characterization of Nanostractured TiO_2 Electrodes Composed with Different Size TiO_2 Nanoparticles
Kumagai Yuki; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 27 Oct. 2004, Proceedings of Symposium on Ultrasonic Electronics, 25, 105-106, Japanese, 1348-8236, 110007458337, AA1240726X

P1-46 Characterization of Optical Absorption and Thermal Diffusivity for Nanocrystaline Silicon
Inoguchi M.; Shen Q.; Toyoda T.
Steering committee of symposium on ultrasonic electronics, 27 Oct. 2004, Proceedings of Symposium on Ultrasonic Electronics, 25, 103-104, Japanese, 1348-8236, 110007458336, AA1240726X

P1-49 Photoacoustic and photoelectrochemical current characterization of nanostructured TiO_2 electrodes : annealing temperature dependence
Sato Tadakazu; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 27 Oct. 2004, Proceedings of Symposium on Ultrasonic Electronics, 25, 109-110, Japanese, 1348-8236, 110007458339, AA1240726X

P2-E-36 Photoacoustic and Photoelectrochecnical Current Spectra of Nanostructured TiO_2 Electrodes Composed with Different Size TiO_2 Nanoparticles
Kumagai Yuki; Qing Shen; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 12 Nov. 2003, Proceedings of Symposium on Ultrasonic Electronics, 24, 189-190, Japanese, 1348-8236, 110007458177, AA1240726X

P2-E-35 Characterization of Nanostructured TiO_2 Electrodes Sensitized with CdSe Quantum Dots Using Photoacoustic and Photoelectrochemical Current Methods
Qing Shen; Arae Dai; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 12 Nov. 2003, Proceedings of Symposium on Ultrasonic Electronics, 24, 187-188, Japanese, 1348-8236, 110007458176, AA1240726X

C-4 Photoacoustic and photoelectrochemical current response of nanostructured TiO_2 electrodes
Toyoda Taro; Hayashi Masashi; Shen Qing
Steering committee of symposium on ultrasonic electronics, 07 Nov. 2002, Symposium on ultrasonic electronics, 23, 125-126, Japanese, 110007464420, AN10578660

Photoacoustic Characterization of Highly Porous, Polycrystalline TiO_2 Electrodes Fabricated with Different Applied Voltage Treatments
HAYASHI M.; SHEN Q.; TOYODA T.
We report the effect of voltage on a concentrated KCI electrolyte applied to highly porous, polycrystalline TiC_2 films on the photoacoustic (PA) and photoelectrochemical (PEC) current spectra. The PA signal intensities of the TiO_2 films with the different applied voltage treatments are higher than that without the treatments below the band-gap region, suggesting an inner-band transition due to an increase of carrier concentration by the voltage treatments. The PA intensity below the band-gap region increases with the increase of the applied voltage, indicating the increase of the carrier concentration. The PEC spectra for the applied voltage treatments with -1.5 V and without the treatments show broad bands at approximately around 3.31 eV. The PEC spectra for the applied voltage treatments over -1.5 V show two peaks at approximately around 3.31 eV and 3.88 eV. The intensities of the each peak positions increase rapidly above the applied voltage of -1.5 V. The increase of the PEC intensity with the different applied voltage treatments implies an increase carrier concentration due to donor levels formation by the treatments., The Institute of Electronics, Information and Communication Engineers, 13 May 2002, IEICE technical report. Ultrasonics, 102, 67, 1-5, Japanese, 0913-5685, 110003188504, AN1001290X

Photoacoustic Characterization of Thermal Properties of Porous Silicon Films
SHEN Q.; TOYODA T.
Since porous silicon(PS)showed efficient luminescence at room temperature, a strong interest has been attracted on both the light emission mechanism and the applications of PS such as light emitting devices, thermal insulators, and optical devices. It is important to study the optical and thermal properties of PS for these applications. In particularly, it is desirable to measure the properties of PS without separating PS from a Si substrate. In this paper, we report our experimental results on the measurements of thermal diffusivities of PS samples with different porosities using the transmitted photoacoustic method. We will show how the thermal diffusivity of PS changes with the porosities of the PS., The Institute of Electronics, Information and Communication Engineers, 12 Dec. 2001, IEICE technical report. Ultrasonics, 101, 514, 7-13, Japanese, 0913-5685, 110003188471, AN1001290X

P1-28 Photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO_2 filmes
Hayashi Masashi; Sato Jun; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 07 Nov. 2001, Symposium on ultrasonic electronics, 22, 119-120, Japanese, 110007464207, AN10578660

P2-25 Photoacoustic spectra of ZnS:Mn Nanocrystals
Matsuzawa Juichiro; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 07 Nov. 2001, Symposium on ultrasonic electronics, 22, 221-222, Japanese, 110007464258, AN10578660

Photoacoustic Spectra of Low-Dimensional Magnet of VOMoO4 (Photoacoustic and Photothermal Phenomena--11th International Conference Kyoto, Japan June 2000)
Toyoda Taro; Shen Qing; Shiozaki Ikuyo
Japan Society for Analytical Chemistry, 2001, Analytical Sciences, 17, s47-49, English, 0910-6340, 40005335921, AA10500785

Optical absorption measurements by photothermal methods
TOYODA Taro; SHEN Qing
応用物理学会, Mar. 1998, 應用物理, 67, 3, 283-288, Japanese, 0369-8009, 10005093579, AN00026679

PA13 Photoacoustic and Photoconductive Spectra of CdInGaS_4
Yamamuro Masamichi; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 12 Nov. 1997, Symposium on ultrasonic electronics, 18, 143-144, Japanese, 110007461255, AN10578660

PD7 Photoacoustic Spectra for CdS_xSe_<1-x>(0≦x≦1) Doped Glass
Kato Yuichiro; Shen Qing; Toyoda Taro
Steering committee of symposium on ultrasonic electronics, 23 Oct. 1996, Symposium on ultrasonic electronics, 17, 29-30, Japanese, 110007461019, AN10578660

Unusual enhancement of transient reflecting grating signal under a surface plasmon resonance condition
K Katayama; Q Shen; A Harata; T Sawada
Oct. 1996, APPLIED PHYSICS LETTERS, 69, 17, 2468-2470, English, 0003-6951, 80009258212, WOS:A1996VN89800006

ANALYSIS OF THE THERMAL AND ACOUSTIC PROPERTIES OF ION-IMPLANTED DIAMOND-LIKE CARBON-FILMS USING THE TRANSIENT REFLECTING GRATING TECHNIQUE
Q SHEN; A HARATA; T SAWADA
Feb. 1995, JOURNAL OF APPLIED PHYSICS, 77, 4, 1488-1491, English, 0021-8979, 80008122330, WOS:A1995QG50000019

ANALYSIS OF METALLIC MULTILAYERS USING HYPERSONIC SURFACE-WAVES INDUCED BY TRANSIENT REFLECTING GRATINGS
Q SHEN; A HARATA; T SAWADA
Aug. 1993, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 32, 8, 3628-3632, English, 0021-4922, WOS:A1993LU48600057

Perovskite Materials and Devices
Yaohong Zhang; Yu Chen; Guohua Wu; Haizheng Zhong; Qing Shen
English, Contributor, Chapter 9 Halide Perovskite Nanocrystals and Applications to Solar Cells, Wiley‐VCH GmbH, 21 Jun. 2022

Perovskite Photovoltaics and Optoelectronics: From Fundamentals to Advanced Applications
Yaohong Zhang; Guohua Wu; Qing Shen
English, Contributor, Quantum Dots of Halide Perovskite, Wiley‐VCH Verlag GmbH & Co. KGaA, 07 Feb. 2022

Quantum Dots of Halide Perovskite
Yaohong Zhang; Guohua Wu; Qing Shen
English, Joint work, 07 Feb. 2022

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications
Q.Shen; Y. Ogomi; T. Toyoda; K. Yoshino; S. Hayase
English, Joint work, Chapter 13 Optical Absorption, Charge Separation and Recombination Dynamics in Pb and Sn/Pb Cocktail Perovskite Solar Cells and Their Relationships to the Photovoltaic Properties, INTECH, Feb. 2016

太陽光と光電変換機能
Japanese, Joint work, 第3章「新規素子開発」、３半導体量子ドットの多重励起子生成と太陽電池への応用, シーエムシ―出版社, 28 Jan. 2016

Quantum Dot Solar Cells
Q. Shen; T. Katayama; T. Toyoda
English, Joint work, The dynamics of multiple exciton generation in semiconductor quantum dots, Springer, 2014

量子ドット太陽電池の最前線
Japanese, Joint work, 第2章 1 化学吸着法、第3章 1.2ショットキー太陽電池、1.3空乏ヘテロ型, シーエムシ―出版社, Oct. 2012

Quantum Dot Devices
Q. Shen; T. Toyoda
English, Joint work, Semiconductor Quantum Dot-Sensitized Solar Cells Employing Chapter 13 TiO2 Nanostructured Photoanodes with Different Morphologies, Springer, Apr. 2012

Trendsand Topics in Sensitized and Organic Solar Cells
Q. Shen; T. Toyoda
English, Joint work, Part II Chapter2 Semiconductor quantum dot-sensitized solar cells: effects of surface modification and photoanode morphology on photovoltaic properties, CMC, 2012

Solar Cells - New Aspects and Solutions
T. Toyoda; Q. Shen
English, Joint work, Chapter 22 Optical Absorption and Photocurrent Spectra of CdSe Quantum Dots Adsorbed on Nanocrystalline TiO2 Electrode Together with Photovoltaic Properties, INTECH, Nov. 2011

Solar Cells - New Aspects and Solutions
Q. Shen; T. Toyoda
English, Joint work, Chapter 13 Ultrafast Electron and Hole Dynamics in CdSe Quantum Dot Sensitized Solar Cells, INTECH, Nov. 2011

レーザー分光分析
Japanese, Joint work, 第３章 超高速分光 3.2節 固体と表面の分光１, 丸善株式会社, Jun. 2009

電子材料ハンドブック
Japanese, Joint work, 第７章「光機能材料」, 朝倉書店, Nov. 2006

Efficient Hot Carrier Dynamics and Extraction inPerovskite Quantum Dots for Next-Generation Solar Cells
沈 青
Invited oral presentation, The 3rd International Frontier Forum on Coupled Photo-electro-thermal Energy Conversion, Invited
12 Apr. 2025

Ligand passivation of Bi-doped Cs2SnCl6 double perovskite defects to achieve stable high luminescence
SUJUN JI; Boyu Zhang; Shikai Chen; Yongge Yang; Feng Liu; Shuzi Hayase; Qing Shen
Oral presentation, 第72回応用物理学会春季学術講演会
17 Mar. 2025

スズ系ペロブスカイト太陽電池の界面における電荷再結合と格子歪みに関する研究
劉 東; 李 玉勝; 王 亮; 王 丹丹; 劉 嘉琪; 早瀬 修二; 沈 青
Oral presentation, 第72回応用物理学会春季学術講演会
17 Mar. 2025

Synthesis of Stable Inorganic Colloidal Tin-based Perovskite Nanocrystals via Sn (IV) Control
Yusheng Li; Dandan Wang; Shuzi Hayase; Qing Shen
Oral presentation, 第72回応用物理学会春季学術講演会
15 Mar. 2025

Photophysical Properties of Inorganic Tin-Lead Alloyed Perovskite Nanocrystals
DAN DAN WANG; Yusheng Li; Shuzi Hayase; Qing Shen
Oral presentation, 第72回応用物理学会春季学術講演会
15 Mar. 2025

Over 15% Efficiency of PbS Quantum Dot Solar Cells by Synergistic Effects of Three Interface Engineering
YUYAO WEI; CHAO DING; DANDAN WANG; SHUZI HAYASE; QING SHEN
Oral presentation, 第72回応用物理学会春季学術講演会
15 Mar. 2025

In-situ room-temperature synthesis of all colloidal quantum dot CsPbBr3-PbS heterostructures
yongge yang; yusheng li; shuzi hayase; qing shen
Oral presentation, 第72回応用物理学会春季学術講演会
15 Mar. 2025

ペロブスカイト量子ドットの光物性と光励起キャリアダイナミクスおよび光電変換デバイスへの応用
沈 青
Invited oral presentation, 第72回応用物理学会春季学術講演会, Invited
14 Mar. 2025

ペロブスカイト量子ドットの合成と太陽電池への応用
大友 俊二; 寳寺 峻吉; 楊 永閣; 豊田 太郎; 早瀬 修二; 沈 青
第72回応用物理学会春季学術講演会
14 Mar. 2025

電子輸送層にPbS量子ドットを導入した有機太陽電池
二井田 隆哉; 高橋 啓; 魏 玉瑶; 豊田 太郎; 早瀬 修二; 沈 青
第72回応用物理学会春季学術講演会
14 Mar. 2025

Interface Engineering and Charge Carrier Management of Quantum Dot Solar
沈 青
Invited oral presentation, Asia-Pacific Conference on Perovskite, Organic Photovoltaics & Optoelectronics, Invited
20 Jan. 2025

Charge Carrier Recombination and Extraction at the Interfaces of Tin-Based Perovskite Solar Cells and Their Effects on the Photovoltaic Performance
Dong Liu; Yusheng Li; Liang Wang; Dandan Wang; Jiaqi Liu; Shuzi Hayase; Qing Shen
PVSEC-35
14 Nov. 2024

Organic solar cells with lead sulfide quantum dots as solid additives
Kei Takahashi; Yuyao Wei; Chao Ding; Taro Toyoda; Shuzi Hayase; Qing Shen
PVSEC-35
14 Nov. 2024

Stability of FAPbI3 perovskite quantum dot solar cells
Shunkichi Hoji; Hua Li; Shuzi Hayase; Qing Shen
PVSEC-35
14 Nov. 2024

Synthesis and Photophysical Property of Colloidal Quantum Dots as well as Application to Solar Cells
沈 青
Invited oral presentation, PVSEC-35, Invited
12 Nov. 2024

Optical Properties in Mixed Tin-Lead Perovskite Nanocrystals
Dandan Wang; Yusheng Li; Shuzi Hayase; Qing Shen
PVSEC-35
12 Nov. 2024

Stable Inorganic Colloidal Tin and Tin-Lead Perovskite Nanocrystals with Ultra-Long Carrier Lifetime via Sn (IV) Control
Yusheng Li; Dandan Wang; Shuzi Hayase; Qing Shen
PVSEC-35
12 Nov. 2024

In-situ epitaxial growth of 2D-3D perovskite nanocrystal heterojunction inks
Yongge Yang; Shuzi Hayase; Qing Shen
PVSEC-35
12 Nov. 2024

Synthesis Optimization of PbS Quantum Dot Inks for Active Layer of PbS Quantum Dot Solar Cells
YUYAO WEI; Chao Ding; Shuzi Hayase; Qing Shen
PVSEC-35
12 Nov. 2024

Synergistic Control and Passivation of Interfaces in PbS Quantum Dot Solar Cells
CHAO DING; Dandan Wang; Shuzi Hayase; Taizo Masuda; Zhigang Zou; Ruixiang Wang; Qing Shen
Oral presentation, PVSEC-35
11 Nov. 2024

Photoexcited Carrier Dynamics in Iodine-Doped CH3NH3PbBr3 Single Crystals
Dong Liu; Hua Li; Yusheng Li; Dandan Wang; Yongge Yang; Yuyao Wei; Shikai Chen; Guozheng Shi; Taro Toyoda; Shuzi Hayase; Qing Shen
The 85th JSAP Autumn Meeting 2024
19 Sep. 2024
16 Sep. 2024- 20 Sep. 2024

Colloidal Quantum Dots: Synthesis, Optical Property and Applicaiton to Solar Cells
Qing Shen
Public symposium, English, The 24th International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-24) and the International Conference on Artificial Photosynthesis-2024 (ICARP2024), Invited
30 Jul. 2024
28 Jul. 2024- 02 Aug. 2024

Less defect and stable perovskite quantum dots for solar cell applications
Qing Shen
Nominated symposium, English, International Symposium on Solar Energy 2024, Invited
23 Jul. 2024
22 Jul. 2024- 23 Jul. 2024

The Effects of Perovskite Quantum Dot Additives on the Perovskite Film Property and the Photovolatic Conversion Efficiency Enhancement of Perovskite Solar Cells
Qing Shen
English, The 41st International Conference of Photopolymer Science and Technology, Invited
26 Jun. 2024
25 Jun. 2024- 28 Jun. 2024

Unraveling charge transport layer effects on thermal stability in mixed A-site tin-based halide perovskite films
Wang Dandan; Li Yusheng; Wang Liang; Liu Dong; Liu Jiaqi; Hayase Shuzi; Shen Qing
Oral presentation, The 71st JSAP Spring Meeting 2024
22 Mar. 2024- 25 Mar. 2024

Transport and Extraction of Photoexcited Charge Carriers in Tin Based Perovskites
Dong Liu; Yusheng Li; Dandan Wang; Liang Wang; Jiaqi Liu; Shuzi Hayase; Qing Shen
Oral presentation, 2024年 第71回 応用物理学会 春季学術講演会
22 Mar. 2024- 25 Mar. 2024

両性イオンをリガンドとした無機ハロゲン化スズペロブスカイト量子ドットの合成と光物性
海野 弘貴; 李 玉胜; 豊田 太郎; 早瀬 修二; 沈 青
Poster presentation, 2024年 第71回 応用物理学会 春季学術講演会
22 Mar. 2024- 25 Mar. 2024

p型とn型のPbS量子ドットの作製と光物性評価
金子 沙有里; 魏 玉瑶; ウィチャイヨ ナパスダ; 早瀬 修二; 豊田 太郎; 沈 青
Poster presentation, 2024年 第71回 応用物理学会 春季学術講演会
22 Mar. 2024- 25 Mar. 2024

Optical Property, Photoexcited Carrier Dynamics and Application to Solar cells of Perovskite Quantum Dots
Qing Shen
Australia-Japan Joint Conference on Perovskite Solar Cells, Invited
05 Jan. 2024- 05 Jan. 2024

Less Defect and Phase Stable Perovskite Nanocrystals
Qing Shen
Invited oral presentation, International Summit on Organic and Hybrid Photovoltaics Stability (ISOS-14) and Woman Leaders in Solar Energy, Invited
08 Nov. 2023- 10 Nov. 2023

Phase stable and less defect tin-based perovskite nanocrystals: synthesis, optical property and photoexcited carrier dynamics
Qing Shen
Invited oral presentation, The 34th International Photovoltaic Science and Engineering Conference (PVSEC34), Invited
05 Nov. 2023- 10 Nov. 2023

Cs2NaInCl6ダブルペロブスカイト量子ドットの表面リガンド
戸佐 圭汰; 丁 超; 早瀬 修二; 沈 青
Oral presentation, 2023年 第84回 応用物理学会 秋季学術講演会
19 Sep. 2023- 23 Sep. 2023

Photocurrent Enhancement in PbS Quantum Dot Solar Cells with PbS Hole Transport Layer Passivated by Short Organic Ligands through two-step ligand exchange method
Yuyao Wei; Chao Ding; Guozheng Shi; Shuzi Hayase; Qing Shen
Poster presentation, The 31th International Conference on Photochemistry
23 Jul. 2023- 28 Jul. 2023

Optical properties and photoexcited carrier dynamics of CH3NH3PbBrxI3-x single crystals
Dong Liu; Hua Li; Yusheng Li; Taro Toyoda; Shuzi Hayase; Chao Ding; Qing Shen
Poster presentation, The 31th International Conference on Photochemistry
23 Jul. 2023- 28 Jul. 2023

Organic solar cells with PbS quantum dots additives in the active layer
Kei Takahashi; Taiga Matsumoto; Yuyao Wei; Chao Ding; Taro Toyoda; Shuzi Hayase; Qing Shen
Poster presentation, The 31th International Conference on Photochemistry
23 Jul. 2023- 28 Jul. 2023

Optical property of blue photoluminescence perovskite quantum dots
Akihito Fuchimoto; Yongge Yang; Hua Li; Yusheng Li; Taro Toyoda; Shuzi Hayase; Chao Ding; Taizo Masuda; Qing Shen
Poster presentation, The 31th International Conference on Photochemistry
23 Jul. 2023- 28 Jul. 2023

Red Emission of Cs2NaInCl6 Double Perovskite Quantum Dots
Keita Tosa; Chao Ding; Shuzi Hayase; Qing Shen
Poster presentation, The 31th International Conference on Photochemistry
23 Jul. 2023- 28 Jul. 2023

界面修飾によるペロブスカイト量子ドット太陽電池の光電変換特性の向上
宝寺 峻吉; 丁 超; 李 花; 矢嶋 祥太; 豊田 太郎; 早瀬 修二; 沈 青
J-PVS第20回「次世代の太陽光発電システム」シンポジウム
29 Jun. 2023- 30 Jun. 2023

活性層にPbS量子ドットを添加した有機太陽電池
高橋 啓; 松本 大河; 魏 玉瑶; 丁 超; 豊田 太郎; 早瀬 修二; 沈 青
Poster presentation, J-PVS第20回「次世代の太陽光発電システム」シンポジウム
29 Jun. 2023- 30 Jun. 2023

Photocurrent Enhancement in PbS Quantum Dot Solar Cells with Quantum Dot Hole Transport Layer Passivated by Short Organic Ligands
Yuyao Wei; Chao Ding; Guozheng Shi; Shuzi Hayase; Qing Shen
Oral presentation, The 40th International Conference of Photopolymer Science and Technology
27 Jun. 2023- 30 Jun. 2023

Numerical optimizations of lead sulfide colloidal quantum dot solar cells
Wang Dandan,Li Yusheng; Ding Chao; Hayase Shuzi; Shen Qing
Poster presentation, The 70th JSAP Spring Meeting 2023
15 Mar. 2023- 18 Mar. 2023

Passivation on ZnO NWs to enhance the efficiency of PbS/ZnO NW QDSCs
Yuyao Wei; Chao Ding; Mako Nakamura; Shuzi Hayase; Qing Shen
Poster presentation, The 70th JSAP Spring Meeting 2023
15 Mar. 2023- 18 Mar. 2023

鉛錫ペロブスカイト単結晶の光学特性に関する研究
劉 東; 李 花; 李 玉勝; 豊田 太郎; 早瀬 修二; 丁 超; 沈 青
Poster presentation, 2023年 第70回 応用物理学会 春季学術講演会
15 Mar. 2023- 18 Mar. 2023

界面修飾によるペロブスカイト量子ドット太陽電池の光電変換特性の向上
宝寺 峻吉; 丁 超; 李 花; 矢嶋 祥太; 豊田 太郎; 早瀬 修二; 沈 青
Poster presentation, 2023年 第70回 応用物理学会 春季学術講演会
15 Mar. 2023- 18 Mar. 2023

活性層にPbS量子ドットを添加した有機太陽電池
高橋 啓; 松本 大河; 魏 玉瑶; 丁 超; 豊田 太郎; 早瀬 修二; 沈 青
Poster presentation, 2023年 第70回 応用物理学会 春季学術講演会
15 Mar. 2023- 18 Mar. 2023

Cs2NaInCl6ダブルペロブスカイトの赤色発光
戸佐 圭汰; 丁 超; 早瀬修二; 沈 青
２０２３年 第７０回応用物理学会 春季講演会
17 Mar. 2023

Hot Carrier Cooling and Extraction Dynamics of Perovskite Quantum Dots
Qing Shen; Yusheng Li; Hua Li; Shota Yajima; Chao Ding
Invited oral presentation, Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics, Invited
22 Jan. 2023- 24 Jan. 2023

Hot carrier cooling and extraction dynamics of perovskite quantum dots".
Qing Shen
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics （IPEROP23）, Invited
24 Jan. 2023

Protecting Hot Carriers by Introducing Inorganic Cations in Halide Perovskite Quantum Dots
Hua Li; Chao Ding; Qing Shen
The 4rd ASEAN-UEC Workshop on Informatics and Engineering
19 Dec. 2022

塩化ゲルマニウム前駆体を用いたCs2NaInCl6ペロブスカイト量子ドットの作製と光物性
戸佐 圭汰; 丁 超; 早瀬 修二; 沈 青
２０２２年 第８３回応用物理学会 秋季講演会
22 Sep. 2022

光音響法による MAPbX3 (X= Br, I) 単結晶 の 電子物性 と熱物性の研究
劉 東; 李 花; 李 玉勝; 豊田 太郎; 早瀬 修二; 丁 超; 沈 青
２０２２年 第８３回応用物理学会 秋季講演会
22 Sep. 2022

青色発光ペロブスカイト量子ドットの合成と光物性
淵本秋人; 丁 超; 矢嶋 祥太; 豊田 太郎; 早瀬 修二; 増田 泰三; 沈 青
２０２２年 第８３回応用物理学会 秋季講演会
22 Sep. 2022

ペロブスカイト太陽電池の光励起キャリアダイナミクスと光電変換特性に及ぼすペロブスカイト量子ドットの効果
長内 亮太; 丁 超; 李 花; 李玉勝; 早瀬 修二; 沈 青
２０２２年応用物理学会 秋季講演会, Peer-reviewed
22 Sep. 2022

有機無機ハロゲン化スズペロブスカイト量子ドットの合成と光物性
矢嶋祥太; 丁超; 李玉胜; 李 花; 豊田太郎; 早瀬修二; 沈青
第83回応用物理学会秋季学術講演会, Peer-reviewed
22 Sep. 2022

Synthesis, optical property and photoexcited carrier dynamics of phase stable and less-defect perovskite nanocrystals for application in solar cells
Qing Shen
The 39th International Conference of Photopolymer Science and Technology, Invited
30 Jun. 2022

Optical property, photoexcited carrier dynamics and application to solar cells of phase stable and less-defect perovskite nanocrystal
Qing Shen; Chao Ding; Hua Li; Yusheng Li; Shota Yajima
E-MRS WiRE 2022, Invited
02 Jun. 2022

Device simulations: Reducing non-radiative recombination losses for achieving >15% efficient lead sulfide quantum dot solar cells
Wang Dandan; Ding Chao; Xing Meibo; Wu Haifeng; Wang Ruixiang; Shen Qing
Applied Energy Symposium: Clean Energy Towards Carbon Neutrality
23 Apr. 2022

Optical property, photoexcited carrier dynamics and application to solar cells of perovskite nanocrystals
Qing Shen; Yusheng Li; Hua Li; Chao Ding
Invited oral presentation, English, Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22), Invited, International conference
20 Apr. 2022

Hot carrier cooling of CsSnxPb1-xBr3 quantum dots
S. Yajima; C. Ding; T. Toyoda; S. Hayase; Q. Shen; “Hot carrier cooling of CsSnxP; xBr; quantum dots”; Material Research Meati
13 Dec. 2021

CsSnxPb1-xI3ペロブスカイト量子ドットの合成と光物性
矢嶋祥太; 丁超; 豊田太郎; 早瀬修二; 沈青
矢嶋祥太, 丁超, 豊田太郎, 早瀬修二, 沈青, CsSnxPb1-xI3ペロブスカイト量子ドットの合成と光物性, 第82回応用物理学会秋季学術講演会, 2021年9月13日
13 Sep. 2021

APbBr3ペロブスカイトナノ結晶の光物性と光励起キャリアダイナミクスおよび安定性, 第68回応用物理学会春季学術講演会, 2021年3月17日
矢嶋祥太; 劉峰; 張耀紅; 丁超; 豊田太郎; 早瀬修二; 沈青
第68回応用物理学会春季学術講演会
17 Mar. 2021

Phase Stable and Less-Defect Perovskite Quantum Dots: Optical Property, Photoexcited Carrier Dynamics, and Application to Solar Cells
Invited oral presentation, English, ECS Meeting, International conference
05 Oct. 2020

Less-Defect Perovskite Quantum Dots: Synthesis, Optical Properties and Application to Optoelectronic Devices
Qing SHEN; Feng LIU; Yaohong ZHANG; Chao DING; Taro TOYODA; Shuzi HAYASE
Invited oral presentation, English, Materials research meeting 2019, Invited, YOKOHAMA,JAPAN, https://mrm2019.jmru.org/, International conference
10 Dec. 2019

Phase Stable and Less-Defect Perovskite Quantum Dots: Optical Property, Photoexcited Hot Carrier Dynamics, Charge Transfer and Application to Optoelectronic Devices
Qing Shen; Feng Liu; Chao Ding; Yaohong Zhang; Taro Toyoda; Shuzi Hayase
Invited oral presentation, English, Proceedings of nanoGe Fall Meeting19 (NGFM19), Invited, Berlin, Germany, https://www.nanoge.org/NGFM19/home, International conference
04 Nov. 2019

Surface Coatings for Improving Solar Cell Efficiencies
Qing Shen; Chao Ding; Yaohong Zhang; Feng Liu; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, 14th Topical Meeting on Optical Interference Coatings, Invited, New Mexico, USA, International conference
02 Jun. 2019

Less-Defect Perovskite Nanocrytals: Optical Properties and Application to Solar Cells
F. Liu; Y. Zhang; C. Ding; T. Toyoda; S. Hayase; Q. Shen
Invited oral presentation, English, The 6th Conference on Science and Technology of Emerging Solar Energy Materials, Invited, Beijing, China, http://solar.iphy.ac.cn/2019/solar_confen.html, International conference
25 May 2019

Phase-stable and high optoelectronic quality all-inorganic perovskite quantum dots and their application in optoelectronic devices
F. Liu; Y. Zhang; C. Ding; T. Toyoda; S. Hayase; Q. Shen
Invited oral presentation, English, 2019 MRS Spring Meeting & Exhibit, Phoenix, USA, https://www.mrs.org/spring2019, International conference
22 Apr. 2019

Colloidal Synthesis of Phase-Stable and Defect-Free Perovskite Nanocrystals for Use in Solar Cells
F. Liu; Y. Zhang; C. Ding; S. Hayase; T. Toyoda; Q. Shen
Invited oral presentation, English, the 11th International Summit on Organic and Hybrid Photovoltaics Stability (ISOS), Invited, Suzhou, China, International conference
22 Oct. 2018

Interface Engineering, Photoexcited Carrier Dynamics and Mechanism for Improving Photovoltaic Performance of Perovskite Solar Cells
Qing Shen; Chao Ding; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, The 5th Conference on New Generation Solar Cells, Invited, Beijing, China, International conference
27 May 2018

量子ドット太陽電池の電荷分離界面の構築と高効率化への道筋
沈 青
Invited oral presentation, Japanese, 第65回応用物理学会春季学術講演会, Invited, Domestic conference
19 Mar. 2018

量子ドット太陽電池の電荷分離界面の構築と高効率化への道筋
沈 青
Invited oral presentation, Japanese, 第65回応用物理学会春季学術講演会, Invited, 日本応用物理学会, 早稲田大学, Domestic conference
19 Mar. 2018

Charge Transfer Dynamics and Photovoltaic Properties of Perovskite Solar Cells: Effects of Interface Engineering on Photoexcited Carrier Dynamics and Photovoltaic Performance of Perovskite Solar Cells
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO), Invited, Rennes, France, International conference
27 Feb. 2018

Charge Transfer Dynamics and Photovoltaic Properties of Perovskite Solar Cells: Effects of the Energy Level Alignment of Zn1-xMgxO Electron Selective Layer
Qing Shen; Chao Ding; Yaohong Zhang; Feng Liu; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, 2nd Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV18), Invited, Kitakyushu, Japan, International conference
18 Jan. 2018

Photoexcited Carrier Dynamics, Interface Passivation and Mechanism for Improving Photovoltaic Performance of Perovskite Solar Cell
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Oral presentation, English, The 15th International Conference on Advanced Materials (IUMRS-ICAM 2017), Kyoto, Japan, International conference
27 Aug. 2017

量子ドット太陽電池の電荷分離界面の構築と高効率化への道筋
沈 青
Invited oral presentation, Japanese, 第14回「次世代の太陽光発電システム」－未来に向けた太陽光発電の新たな価値創出へー, Invited, 名古屋大学, Domestic conference
20 Jul. 2017

Size-dependent optical absorption, ground state energy, and interfacial electron transfer dynamics of CdSe quantum dots on single crystal rutile-TiO2 (001), (110), and (111) surfaces
Taro Toyoda; Qing Shen; Keita Kamiyama; Kenji Katayama; Shuzi Hayase
Oral presentation, English, 10th International Symposium on Transparent Oxide and Related Materials for Electronics and Optics, Tokyo, Japan, International conference
05 Jun. 2017

Effects of Interface passivation on Photoexcited Carrier Dynamics and Photovoltaic Performance in Perovskite Solar Cell
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, The 4th Conference on New Generation Solar Cells, Invited, Rennes, France, International conference
27 May 2017

Slow Hot Carrier Cooling in Bulk CsPbI3 Perovskite and CsPbI3 Quantum Dots
Qing Shen; Feng Liu; Teresa S. Ripolles; Naoki Nakazawa; Yaohong Zhang; Yuhei Ogomi; Koji Nishinaka; Takuya Izuishi; Taro Toyoda; Shuzi Hayase
Oral presentation, English, International Conference on Hybrid and Organic Photovolatics (HOPV17), Lausanne, Switzerland, International conference
21 May 2017

Effects of Interface Engineering on Photoexcited Carrier Dynamics and Photovoltaic Performance in Perovskite Solar Cell
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, 2017 China PV Technology International Conference, Invited, Xian, China, International conference
30 Mar. 2017

量子ドット太陽電池の電荷分離界面の構築と高効率化への道筋
沈 青
Invited oral presentation, Japanese, 日本化学会第97春季年会, Invited, 日本化学会, 慶応大学, Domestic conference
18 Mar. 2017

Charge Transfer Dynamics and Photovoltaic Properties of Perovskite Solar Cells: Effects of Interface Engineering on Photoexcited Carrier Dynamics and Photovoltaic Performance of Perovskite Solar Cells
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO), Invited, Rennes, France, International conference
27 Feb. 2017

Photoexcited Carrier Dynamics, Interface Passivation and Mechanism for Improving Photovoltaic Performance in perovskite solar cells
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Takashi Minemoto; Shuzi Hayase
Invited oral presentation, English, Asia Pacific Hybrid and Organic Photovoltaics Conferece (AP-HOPV17), Invited, Yokohama, International conference
03 Feb. 2017

Perovskite and Quantum Dot Solar Cells: Photoexcited Carrier Dynamics, Interface Engineering and Mechanism for Improving Photovoltaic Performance
Qing Shen; Taro Toyoda; Shuzi Hayase
Invited oral presentation, English, 12th China SoG Silicon and PV Power Conference, Invited, Jiaxing, China, International conference
24 Nov. 2016

Photoexcited Carrier Dynamics in Perovskite Solar Cells: Uncovering the Mechanism for Achieving High Efficiency
Qing Shen; Yuhei, Ogomi; Kenji Yoshino; Taro Toyoda; Shuzi Hayase
Invited oral presentation, English, The 10th Aseanian Conference on Nano-Hybrid Solar Cells, Invited, Beijing, International conference
22 Sep. 2016

高速レーザー分光法による太陽電池での光励起キャリアダイナミクスの解明－量子ドット太陽電池とペロブスカイト太陽電池について－
沈 青
Invited oral presentation, Japanese, 2016年応用物理学会秋季学術講演会, Invited, 応用物理学会, 新潟, Domestic conference
14 Sep. 2016

量子ドット太陽電池のナノ界面制御と高効率化
沈 青; 豊田太郎
Nominated symposium, Japanese, 2016年応用物理学会秋季学術講演会, Invited, 応用物理学会, 新潟, Domestic conference
13 Sep. 2016

Slow Hot Carrier Cooling and Fast Hole Transfer to P3HT in Cesium Lead Iodide (CsPbI3) Perovskite
Qing Shen; Teresa S. Ripolles; Yuhei Ogomi; Koji Nishinaka; Takuya Izuishi; Kenji Katayama; Taro Toyoda; Kenji Yoshino; Shuzi Hayase
Oral presentation, English, International Conference on Hybrid and Organic Photovolatics (HOPV16), International conference
28 Jun. 2016

Slow hot carrrier cooling and ultrafast hole transfer in CsPbI3 perovskite: potential for hot carrier solar cell application
Qing Shen; Teresa S. Ripolles; Yuhei Ogomi; Koji Nishinaka; Takuya Izuishi; Kenji Katayama; Taro Toyoda; Kenji Yoshino; Shuzi Hayase
Oral presentation, English, the 26th international symposium on photochemistry, International conference
03 Apr. 2016

Slow hot carrier cooling in caesium lead iodide (CsPbI3) perovskite
Qing Shen; Teresa S. Ripolles; Yuhei Ogomi; Koji Nishinaka; Taro Toyoda; Takuya Izuishi; Kenji Yoshino; Shuzi Hayase
Oral presentation, English, 2016 MRS Spring Meeting & Exhibit, Phoenix, USA, International conference
28 Mar. 2016

量子ドット太陽電池のナノ界面制御と高効率化
沈 青; 豊田太郎
Invited oral presentation, Japanese, 日本化学会第96春季年会, Invited, 日本化学会, 京都, Domestic conference
24 Mar. 2016

Quantum Dot and Perovskite Solar Cells: Interface Engineering, Photoexcited Carrier Dynamics and Mechanism for Improving Photovoltaic Performance
Q. Shen; T. Toyoda; S. Hayase
Nominated symposium, English, Japanese Swiss Energy Materials Workshop, Invited, International conference
Mar. 2016

Optical absorption, charge separation and recombination in perovskite solar cells and their relationships to photovoltaic performances
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Shuzi Hayase
Nominated symposium, English, Organic/dye-sensitized/perovskite solar cell workshop, Invited, International conference
05 Dec. 2015

量子ドット太陽電池の多重励起子生成の解析
沈 青
Public discourse, Japanese, 応用物理学会有機分子・バイオエレクトロニクス分科講習会 「次世代太陽エネルギー変換デバイスの研究開発を支える先端計測」, Invited, Domestic conference
Nov. 2015

ペロブスカイト太陽電池の光励起キャリアダイナミクス
沈 青
Invited oral presentation, Japanese, 学振１７５委員会 有機系太陽電池分科会 第３回研究会, Invited, Domestic conference
Nov. 2015

ペロブスカイト系太陽電池の最前線I
沈 青
Invited oral presentation, Japanese, 第五回次世代太陽電池研究会, Invited, Domestic conference
Jun. 2015

Uncovering the Detailed Mechanism behind High Efficiency Perovskite Hybrid Solar Cells by Studying Charge Separation and Recombination Dynamics
Q. Shen; Y. Ogomi; K. Yoshino; T. Toyoda; S. Hayase
Invited oral presentation, English, The 2nd Conference on New Generation Solar Cells, Invited, International conference
23 May 2015

igh Reduction of Interfacial Charge Recombination in PbS Heterojunction Colloidal Quantum Dot Solar Cells by Metal Oxide Surface Passivation
J. Chang; Y. Kuga; I. Mora-Seró; T. Toyoda; Y. Ogomi; S. Hayase; J. Bisquert; Q. Shen
Oral presentation, English, The International Conference on Hybrid and Organic Photovoltaics (HOPV15), International conference
May 2015

ペロブスカイト型の電荷ダイナミクス
沈 青
Nominated symposium, Japanese, CiRfSEシンポジウム, Invited, Domestic conference
Mar. 2015

量子ドット太陽電池の光励起キャリアダイナミクスと界面制御による光電変換特性向上
沈 青
Invited oral presentation, Japanese, 第11回量子ナノ材料セミナー, Invited, Domestic conference
2015

Charge separation and recombination dynamics in Sn/Pb halide perovskite solar cell: uncovering the bottleneck of photovoltaic efficiency
Qing Shen; Yuhei Ogomi; Taro Toyoda; Kenji Yoshino; Shuzi Hayase
Oral presentation, English, The International Conference Solution processed Semiconductor Solar Cells, International conference
Sep. 2014

Uncovering the Mechanism of High Efficiency of Perovskite Solid-State Hybrid Solar Cells by Studying Charge Separation and Recombination
Q. Shen; Y. Ogomi; S. Tsukamoto; K. Kukihara; T. Oshima; N. Osada; K. Yoshino; K. Katayama; T. Toyoda; S. Hayase
Invited oral presentation, English, The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014), Invited, International conference
25 Aug. 2014

P1-49 Photoacoustic and photoelectrochemical current characterization of nanostructured TiO_2 electrodes : annealing temperature dependence
Sato Tadakazu; Shen Qing; Toyoda Taro
Japanese, Proceedings of Symposium on Ultrasonic Electronics, Steering committee of symposium on ultrasonic electronics
27 Oct. 2004
27 Oct. 2004- 27 Oct. 2004

P1-46 Characterization of Optical Absorption and Thermal Diffusivity for Nanocrystaline Silicon
Inoguchi M.; Shen Q.; Toyoda T.
Japanese, Proceedings of Symposium on Ultrasonic Electronics, Steering committee of symposium on ultrasonic electronics
27 Oct. 2004
27 Oct. 2004- 27 Oct. 2004

P1-47 Photoacoustic and Photoelectrochemical Current Characterization of Nanostractured TiO_2 Electrodes Composed with Different Size TiO_2 Nanoparticles
Kumagai Yuki; Shen Qing; Toyoda Taro
Japanese, Proceedings of Symposium on Ultrasonic Electronics, Steering committee of symposium on ultrasonic electronics
27 Oct. 2004
27 Oct. 2004- 27 Oct. 2004

P2-E-35 Characterization of Nanostructured TiO_2 Electrodes Sensitized with CdSe Quantum Dots Using Photoacoustic and Photoelectrochemical Current Methods
Qing Shen; Arae Dai; Toyoda Taro
Japanese, Proceedings of Symposium on Ultrasonic Electronics, Steering committee of symposium on ultrasonic electronics
12 Nov. 2003
12 Nov. 2003- 12 Nov. 2003

P2-E-36 Photoacoustic and Photoelectrochecnical Current Spectra of Nanostructured TiO_2 Electrodes Composed with Different Size TiO_2 Nanoparticles
Kumagai Yuki; Qing Shen; Toyoda Taro
Japanese, Proceedings of Symposium on Ultrasonic Electronics, Steering committee of symposium on ultrasonic electronics
12 Nov. 2003
12 Nov. 2003- 12 Nov. 2003

光音響法と光化学電流法によるナノ構造TiO2膜電極の評価
沈 青; 豊田太郎
Oral presentation, Japanese, 第50回応用物理学関係連合講演会講演予稿集
Mar. 2003

メゾポーラス化TiO2膜に固定化したCdSeナノ粒子の光音響・光化学電流スペクトル
豊田太郎; 山本浩之; 林 雅; 新江 大; 沈 青
Oral presentation, Japanese, 第50回応用物理学関係連合講演会講演予稿集
Mar. 2003

ナノ構造を有するTiO2膜電極の光音響・光電流応答特性
豊田太郎; 林 雅; 沈 青
Oral presentation, Japanese, 第50回応用物理学関係連合講演会講演予稿集
Mar. 2003

Mnを不純物として含むZnSナノ粒子の光音響・発光強度の紫外線照射効果
豊田太郎; A.B.Cruz; 沈 青
Oral presentation, Japanese, 第50回応用物理学関係連合講演会講演予稿集
Mar. 2003

Study of optical absorption and electron transport in nanoporous nanocrystalline TiO2 films.
Q.Shen; T.Toyoda
Oral presentation, English, Abstracs of the 5th International Conference on Nano-Molecular Electronics
Dec. 2002

C-4 Photoacoustic and photoelectrochemical current response of nanostructured TiO_2 electrodes
Toyoda Taro; Hayashi Masashi; Shen Qing
Japanese, Symposium on ultrasonic electronics, Steering committee of symposium on ultrasonic electronics
07 Nov. 2002
07 Nov. 2002- 07 Nov. 2002

ナノ構造を有するTiO2電極の光音響・光電流応答特性
豊田太郎; 林 雅; 沈 青
Oral presentation, Japanese, 第23回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集
Nov. 2002

光熱変換現象によるITOおよびメゾポーラス酸化チタンに固定化したCdSeナノ粒子の評価
新江 大; 沈 青; 豊田太郎
Oral presentation, Japanese, 第23回日本熱物性シンポジウム講演論文集
Nov. 2002

CdSナノ粒子を吸着したTiO2光電極の光音響スペクトルと光電変換
豊田太郎; 佐藤 淳; 林 雅; 沈 青
Oral presentation, Japanese, 第21回固体・表面光化学討論会講演要旨集
Nov. 2002

光音響法によるポーラスシリコンの熱伝導率の評価
沈 青; 豊田太郎
Oral presentation, Japanese, 第23回日本熱物性シンポジウム講演論文集
Nov. 2002

ナノ構造を有するTiO2電極の光音響ならびに光電流スペクトル
沈 青; 豊田太郎
Oral presentation, Japanese, 第40回粉体に関する討論会講演論文集
Nov. 2002

Porosity dependence of thermal conductivity for porous silicon characterized by photoaccoustic technique.
Q.Shen; T.Toyoda
Invited oral presentation, English, Proceedings of the International Workshop on Modern Science and Technology, International conference
Sep. 2002

Mn ion concentration dependence of the photothermal and photoluminescence spectra for ZnS:Mn nanocrystals.
T.Toyoda; J.Matsuzawa; A.B.Cruz; Q.Shen
Oral presentation, English, Abstracts of the 16th European Conference on Thermophysical Properties
Sep. 2002

Exposure time dependence of the photothermal and photoluminescence intensities for porous silicon with different wavelengths of excitation light
T.Toyoda; T.Yamazaki; R.torai; Q.Shen
Oral presentation, English, Abstracts of the 16th European Conference on Thermaphysical Properties
Sep. 2002

Efffect of applied voltage treatments on photothermal and photoelectrochemical current spectra in final preparation processes of porous TiO2 electrodes.
T.Toyoda; M.Hayashi; J.Sato; Q.Shen
Oral presentation, English, Abstracts of the 16th European Conference on Theermophysical Properties
Sep. 2002

Effect of sensitization by quantum-sized CdS on photothermal and photoelectrochemical current spectra of porous TiO2 electrodes.
T.Toyoda; J.Sato; Q.shen
Oral presentation, English, Abstracts of the 16th European Conference on Thermophysical Properties
Sep. 2002

Characterization of optical and thermal properties of porous silicon films on silicon substrate using photothermal technique.
Q.Shen; T.Toyoda
Oral presentation, English, Abstracts of the 16th European Conference on Thermophysical Properties
Sep. 2002

Apparent band-gap energies of mixed TiO2 nanoparticles with anatase and rutile structures characterized with photoacoustic intensity and phase spectra.
T.Toyoda; R.Taira; Q.Shen
Oral presentation, English, Abstracts of the 14th International Conference on Photochemical Conversion and Storage of Solar Energy
Aug. 2002

Effect of applied voltage treatments on photoacoustic and photoelectrochemical current spectra in final preparation processes of porous TiO2 electrodes.
T.Toyoda; M.Hayashi; J.Sato; Q.Shen
Oral presentation, English, Abstracts of the 14th International Conference on Photochemical Conversion and Storage of Solar Energy
Aug. 2002

Mn ion concentration dependence of the photoacoustic and photoluminescence spectra for ZnS:Mn nanocrystals.
T.Toyoda; J.Matsuzawa; A.B.Cruz; Q.Shen
Oral presentation, English, Abstracts of the 14th International Conference on Photochemical Conversion and Storage of Solar Energy
Aug. 2002

Effect of sensitization by quantum-sized CdS on Photoacoustic and photoelectrochemical current spectra of porous TiO2.
T.Toyoda; J.Sato; Q.Shen
Oral presentation, English, Abstracts of the 14th International Conference on Photochemical Conversion and Storage of Solar Energy
Aug. 2002

Efffect of applied voltage treatments on photoacoustic and photoelectrochemical current spectra in final preparation processes of porous TiO2 electrodes.
T.Toyoda; M.Hayashi; J.Sato; Q.Shen
Oral presentation, English, Abstracts of the 12th International Conference on Photoacosutic and Photothermal Phenomena
Jun. 2002

Effect of sensitization by quantum-sied CdS on photoacoustic and photoelectrochemical current spectra of porous TiO2 electrodes.
T.Toyoda; J.Sato; Q.Shen
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena
Jun. 2002

Dependence of the thermal conductivity of porous silicon on its porosity characterized by photoacoustic technique.
Q.Shen; T.Toyoda
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena
Jun. 2002

Apparent band-gap energies of mixed TiO2 nanoparticles with anatase and rutile structures characterized with photoacoustic intensity and phase spectra.
T.Toyoda; R.Taira; Q.Shen
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena.
Jun. 2002

Mn ion concentration dependence and photoluminescence spectra of ZnS:Mn nanocrystals.
T.Toyoda; J.Matsuzawa; A.B.Cruz; Q.Shen
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena
Jun. 2002

Photoacoustic spectroscopy of CdTe nanocrystals doped in a GeO2 glass matrix.
I.Tsuboya; D.Arae; Q.Shen; T.Toyoda
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena
Jun. 2002

Exposure time dependence of the photoacoustic and photoluminescence intensities of porous silicon with different wavelengths of excitation light.
T.Toyoda; T.Yamazaki; R.Torai; Q.Shen
Oral presentation, English, Abstracts of the 12th International Conference on Photoacoustic and Photothermal Phenomena
Jun. 2002

Photoacoustic Characterization of Highly Porous, Polycrystalline TiO_2 Electrodes Fabricated with Different Applied Voltage Treatments
HAYASHI M.; SHEN Q.; TOYODA T.
Japanese, IEICE technical report. Ultrasonics, The Institute of Electronics, Information and Communication Engineers, http://id.ndl.go.jp/bib/6188122, We report the effect of voltage on a concentrated KCI electrolyte applied to highly porous, polycrystalline TiC_2 films on the photoacoustic (PA) and photoelectrochemical (PEC) current spectra. The PA signal intensities of the TiO_2 films with the different applied voltage treatments are higher than that without the treatments below the band-gap region, suggesting an inner-band transition due to an increase of carrier concentration by the voltage treatments. The PA intensity below the band-gap region increases with the increase of the applied voltage, indicating the increase of the carrier concentration. The PEC spectra for the applied voltage treatments with -1.5 V and without the treatments show broad bands at approximately around 3.31 eV. The PEC spectra for the applied voltage treatments over -1.5 V show two peaks at approximately around 3.31 eV and 3.88 eV. The intensities of the each peak positions increase rapidly above the applied voltage of -1.5 V. The increase of the PEC intensity with the different applied voltage treatments implies an increase carrier concentration due to donor levels formation by the treatments.
13 May 2002
13 May 2002- 13 May 2002

TiO2電極における電圧印加処理が光音響スペクトルに及ぼす効果
林 雅; 沈 青; 豊田太郎
Oral presentation, Japanese, 電子情報通信学会技術研究報告
May 2002

Characterization of optical and thermal properties of porous silicon films on silicon substrates using photoacoustic technique.
Qing Shen; Taro Toyoda
Oral presentation, English, Extended Abstracts of the 5th AIST International Symposium on Photoreaction Control and Photofunctional Materials
Mar. 2002

Photoacoustic Characterization of Thermal Properties of Porous Silicon Films
SHEN Q.; TOYODA T.
Japanese, IEICE technical report. Ultrasonics, The Institute of Electronics, Information and Communication Engineers, http://id.ndl.go.jp/bib/6043207, Since porous silicon(PS)showed efficient luminescence at room temperature, a strong interest has been attracted on both the light emission mechanism and the applications of PS such as light emitting devices, thermal insulators, and optical devices. It is important to study the optical and thermal properties of PS for these applications. In particularly, it is desirable to measure the properties of PS without separating PS from a Si substrate. In this paper, we report our experimental results on the measurements of thermal diffusivities of PS samples with different porosities using the transmitted photoacoustic method. We will show how the thermal diffusivity of PS changes with the porosities of the PS.
12 Dec. 2001
12 Dec. 2001- 12 Dec. 2001

P2-25 Photoacoustic spectra of ZnS:Mn Nanocrystals
Matsuzawa Juichiro; Shen Qing; Toyoda Taro
Japanese, Symposium on ultrasonic electronics, Steering committee of symposium on ultrasonic electronics
07 Nov. 2001
07 Nov. 2001- 07 Nov. 2001

P1-28 Photoacoustic and photoelectrochemical current spectra of highly porous, polycrystalline TiO_2 filmes
Hayashi Masashi; Sato Jun; Shen Qing; Toyoda Taro
Japanese, Symposium on ultrasonic electronics, Steering committee of symposium on ultrasonic electronics
07 Nov. 2001
07 Nov. 2001- 07 Nov. 2001

Photoacoustic Spectra of Low-Dimensional Magnet of VOMoO4 (Photoacoustic and Photothermal Phenomena--11th International Conference Kyoto, Japan June 2000)
Toyoda Taro; Shen Qing; Shiozaki Ikuyo
English, Analytical Sciences, Japan Society for Analytical Chemistry, http://id.ndl.go.jp/bib/5769861
2001
2001 2001

Optical absorption measurements by photothermal methods
TOYODA Taro; SHEN Qing
Japanese, 應用物理, 応用物理学会, http://id.ndl.go.jp/bib/4423234
Mar. 1998
Mar. 1998 Mar. 1998

PA13 Photoacoustic and Photoconductive Spectra of CdInGaS_4
Yamamuro Masamichi; Shen Qing; Toyoda Taro
Japanese, Symposium on ultrasonic electronics, Steering committee of symposium on ultrasonic electronics
12 Nov. 1997
12 Nov. 1997- 12 Nov. 1997

PD7 Photoacoustic Spectra for CdS_xSe_<1-x>(0≦x≦1) Doped Glass
Kato Yuichiro; Shen Qing; Toyoda Taro
Japanese, Symposium on ultrasonic electronics, Steering committee of symposium on ultrasonic electronics
23 Oct. 1996
23 Oct. 1996- 23 Oct. 1996

Unusual enhancement of transient reflecting grating signal under a surface plasmon resonance condition
K Katayama; Q Shen; A Harata; T Sawada
English, APPLIED PHYSICS LETTERS, AMER INST PHYSICS, Subnanosecond time-resolved transient reflecting grating (TRG) measurements were carried out under resonance conditions of surface plasmon (SP) with a Kretschmann configuration using a 40-nm-thick gold film deposited on a hemicylindrical prism. The TRG was generated and detected with two pump beams and with one probe beam incident from the prism side, the angles of which for incidence and polarization were changed. When the pump beams resonantly excited SPs, the TRG signal amplitude was enhanced as expected. An unusual enhancement was observed when the probe beam excited SPs, i.e., the TRG signal amplitude was also enhanced strongly although reflecting diffraction was probed under the less reflective condition. This enhancement was accompanied by a transient wave form change. The mechanism of these phenomena is discussed. (C) 1996 American Institute of Physics.
Oct. 1996
Oct. 1996 Oct. 1996

ANALYSIS OF THE THERMAL AND ACOUSTIC PROPERTIES OF ION-IMPLANTED DIAMOND-LIKE CARBON-FILMS USING THE TRANSIENT REFLECTING GRATING TECHNIQUE
Q SHEN; A HARATA; T SAWADA
English, JOURNAL OF APPLIED PHYSICS, AMER INST PHYSICS
Feb. 1995
Feb. 1995 Feb. 1995

ANALYSIS OF METALLIC MULTILAYERS USING HYPERSONIC SURFACE-WAVES INDUCED BY TRANSIENT REFLECTING GRATINGS
Q SHEN; A HARATA; T SAWADA
English, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, JAPAN J APPLIED PHYSICS, Gigahertz surface acoustic waves (the Rayleigh-like modes) have been optically generated and detected on ultrathin (< 1 mum) metallic single-layer and multilayered films attached to glass substrates using the laser-induced transient reflecting grating (TRG) technique. The dispersion relations of the excited Rayleigh-like modes could be constructed experimentally and theoretically. By finding the best fitting of the theoretical dispersion curves to the experimental data, this method can be used to deduce the elastic constants of ultrathin multilayered films.
Aug. 1993
Aug. 1993 Aug. 1993

PbS量子ドットを固体添加剤として用いた有機太陽電池
高橋 啓; 魏 玉瑶; 丁 超; 豊田 太郎; 早瀬 修二; 沈 青
PbS量子ドットを固体添加剤として用いた有機太陽電池

光工学実験第二
Apr. 2023 - Present
The University of Electro-Communications

基礎電子回路
Apr. 2020 - Present

物理学概論第二
Apr. 2019 - Present
The University of Electro-Communications

基 礎 電 子 回 路
The University of Electro-Communications

光工学実験第二
The University of Electro-Communications

基 礎 電 子 回 路
The University of Electro-Communications

基 礎 電 子 回 路
電気通信大学

光工学実験第二
電気通信大学

K課程卒研輪講
The University of Electro-Communications

K課程卒研輪講
電気通信大学

先進理工学専攻基礎
The University of Electro-Communications

先進理工学専攻基礎
電気通信大学

物理学概論第二
The University of Electro-Communications

物理学概論第二
電気通信大学

光エレクトロンニクス実験第二
The University of Electro-Communications

光エレクトロンニクス実験第二
The University of Electro-Communications

光エレクトロンニクス実験第二
電気通信大学

総合コミュニケーション科学
The University of Electro-Communications

総合コミュニケーション科学
電気通信大学

基礎数学演習第一（留学生）
The University of Electro-Communications

基礎数学演習第一（留学生）
The University of Electro-Communications

基礎数学演習第一（留学生）
電気通信大学

熱物性学会

分光学会

ナノ学会

電気化学会

光化学協会

学振第175委員会

日本化学会

応用物理学会

ナノｐｎ接合型量子ドット太陽電池の界面構築による高効率化と多重励起子の電荷分離
沈 青
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), 24K01295
01 Apr. 2024 - 31 Mar. 2027

タンデム太陽電池用鉛フリーワイドバンドギャップ錫ペロブスカイトの研究
Principal investigator
Apr. 2023 - Mar. 2025

Direction toward high-efficiency Sn perovskite solar cells analyzed by impedance
早瀬 修二; 沈 青; カマルディン ムハマドアクマル
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), 鉛を含まないペロブスカイト太陽電池の高効率化が望まれている。錫系ペロブスカイトがその最も期待される候補であるが効率が低いという問題点があった。錫系ペロブスカイト太陽電池の効率を向上するためには結晶欠陥に起因する電荷再結合サイト密度を低下させる必要がある。これまで我々はヨウ素イオン欠陥（undercordinated Sn ion）密度を低下させるために、エチレンジアミンによるパッシベーションが有効であることを示してきた。今回表面撥水性を有するハロゲン化ケイ素(Me3Si-Br)で表面をパッシベーションしたところ、耐久性、効率が向上することを見出した。効率は表面パッシベーション後に10.05%から12.22%に向上した。耐久性は未封止、窒素下で保存したところ、パッシベーション前には40日で30%の効率低下があったが、パッシベーション後は92日間で20%の低下に抑えることができた。ヨウ素イオン欠陥にBrイオンが配位しMe3Siグループが界面、粒界に吸着することにより、ヨウ素イオン欠陥密度を低下させるとともに、粒界を疎水性化し水分の侵入を防止していると推定された。Ms3SiXのXはClイオン=Iイオン 07 Oct. 2019 - 31 Mar. 2023

量子ドット増感系の光誘起電荷移動：基板結晶面の電子構造が増感機能に及ぼす効果
豊田 太郎; 沈 青
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(C), 半導体量子ドット(QD)は太陽電池の増感剤として、色素系を凌駕する特性を持つ。従来の増感型太陽電池ではQDの吸着面積を増大させるために、基板電極としてはナノ粒子集合体酸化物が対象となる(TiO2, ZnO等)。しかしこの電極系は乱雑な多結晶体のために、QDの電子状態や電子移動に関する評価が曖昧になる。本研究は物性が十分に判明されている単結晶基板を対象として、異なる面方位を持つ酸化物単結晶へQD吸着を行い、QDに対する基板の効果を明らかにすることを目的とする。今年度も引き続きルチル型TiO2単結晶の(001), (110), (111)面を対象基板として、さらに３種類の異なる配位子をPbS-QDに結合しQD-QD間の距離の制御を行い、昨年度に得られた結果の再現性について検討を行った。従来と同様に、(1)光音響法(PA)による脱励起状態、(2)吸光度法(Abs)による励起、(3)光電子収量法(PY)によるイオン化エネルギー、の一連の再現性評価を行った。その結果、PAスペクトルとAbsスペクトルの吸収端下の異なることが再確認された。特に(111)基板上ではQD-QD間隔の増大に大きな変化が生じた、これらの結果は脱励起に伴う無輻射緩和による熱生成効率がQD-QD間隔および基板結晶面により異なるという新しい発見につながった。これらの基板情報は、従来の酸化物ナノ粒子集合体電極に対して、増感型太陽電池のエネルギー変換効率向上化を考慮するデバイス設計に対して有用な情報を提供することが可能となると考えられる。, 17K04988
01 Apr. 2017 - 31 Mar. 2023

Elucidation of low efficiency for Sn perovskite solar cells and enhancement of efficiency by heteronanointerface architecture
Shuzi Hayase
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), The purpose of this research is to propose the way to enhance the efficiency of Pb free perovskite solar cells, namely, Sn PVK solar cells. Focus was put on decreasing defect density of PVK crystals including the grain boundary and the heterointerfaces. In order to make clear the performance of Sn PVK layer, no metal dopant was added in B site of ABX3 structure. We aimed at unveiling items retarding the efficiency-enhancement for the Sn-PVK. We found the following items for the efficiency enhancement. 1. Inverted structures are recommended to avoid the direct contact between Sn-PVK and inorganic oxide semiconductors, 2. To reduce the crystal lattice strain by optimizing the size of A site gives higher efficiency, 3. Grain boundary passivation is effective, 4. Addition of reducing agents, such as Sm ion, are useful because of the decrease in the defect density associated with Sn4+., 17H03106
01 Apr. 2017 - 31 Mar. 2020

Dependences of the optical absorption and interfacial electron transfer dynamics of quantum dots adsorbed on singlecrystal rutile TiO2.
Toyoda Taro
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), Quantum dots (QDs) provide an attractive alternative sensitizer to organic dyes. There is a lack of fundamental studies of QD on conventional nanocrystalline TiO2 electrodes with much amount of heteroigeneity. We have shown the dependences of the optical absorption, the ground state energy level, and interfacial electron transfer dynamics on the size of CdSe QDs on single crystal rutile-TiO2. The expenential optical absorption tail indicates a decrease in structural disorder with increasing size. The ground state energy level of the CdSe QDs shows anisotropic, depending on the surface orientation of TiO2. The interfacial electron transfer rate constant decreases with increasing size and depends on the surface orientation of TiO2., 26390016
01 Apr. 2014 - 31 Mar. 2018

Trap distribution analysis for thermal stimulation current of tin-based perovskite thin film
Ogomi Yuhei; SHEN Qing; IIKUBO Satoshi; HAYASE Shuzi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Kyushu Institute of Technology, Grant-in-Aid for Young Scientists (B), Focus has been directed for tin-based perovskite films as a substitute for most widely studied lead halide perovskites. This research has investigated the relationship between crystal growth control of tin-based perovskite along with defect analysis and its implications on the solar cell performance. We have demonstrated a profound enhancement of the short circuit current from 20 mA/cm2 to 30 mA/cm2 using SnI2 complex for the fabrication of tin-halide perovskite as material. It has been found that when TiO2 as electron transporting material and SnI2 were chemically bonded, there was an increase in the TiO2 surface traps. Therefore, efforts were directed to prepare the tin-based perovskite solar cells without using TiO2 which led to the improved device performance. The absorption wavelength was changed by partially replacing the iodine by bromine. SnF2 was also doped in order to supplement metal defects. The conversion efficiency of the solar cell improved from 4.5% to 15.9%., 15K21224
01 Apr. 2015 - 31 Mar. 2017

Nano-interface engineering of heterojunction quantum dot solar cells and the effect on charge separation of multiple excitons
Shen Qing; HAYASE Shuzi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (B), As one candidate of the next generation solar cells, colloidal quantum dot (CQD) based solar cells (CQDSCs) have attracted considerable interest and developed rapidly during the last few years. CQDSCs have some unique advantages such as the band-gap tunability, high absorption coefficient, multiple exciton generation (MEG) possibility and low cost for preparation. Although theoretical energy conversion efficiency of CQDSCs has been predicted to be about 44% much higher than the Shockley-Queisser limit (33%), it is still about 8% at present time (2014). Therefore, fundamental studies on the mechanism for improving energy conversion efficiency of CQDSCs are very important. In this project, we focus on clarifying the photoexcited carrier dynamics, especially the dynamics of MEG and improving the charge separation and suppress recombination in QD heterojunction solar cells by controlling the interfaces of CQDSCs as well as the approaches to improving the energy conversion efficiency., 26286013
01 Apr. 2014 - 31 Mar. 2017

多重励起子生成と表面プラズモン効果による光励起キャリアダイナミクスと光電変換特性
豊田 太郎; 沈 青
日本学術振興会, 科学研究費助成事業, 電気通信大学, 特定領域研究, 近年Au量子ドットを吸着したTiO_2電極において、プラズモン共鳴に基づく光誘起電荷分離が発見されたため、新しい増感太陽電池への応用が注目されている。一方半導体量子ドットが多重励起子生成(MEG)を示すことから、従来の色素増感に代わる半導体量子ドット増感太陽電池が注目されている。本研究はAu量子ドットによる光局在場のMEG生成に与える効果について検討し、MEG生成増大条件を見出し半導体量子ドット増感太陽電池の光電変換向上を目的としている。半導体量子ドットとしてCdSeを、金属量子ドットとしてAuを対象とし、ナノ粒子TiO_2電極への複合化吸着を行った。この系に対して、光吸収特性評価、光電流特性評価を行った。その結果、CdSe量子ドットの平均粒径は作製吸着時間とともに増大し、光電流はある吸着時間で極大を示した。さらに太陽電池デバイスを形成し、光電変換特性評価を行った。その結果、開放電圧と曲線因子は、CdSe量子ドット単独吸着の場合もAu/CdSe複合化吸着も大きな違いは見られなかった。しかし短絡電流はCdSe量子ドットの吸着時間が短時間の場合には、複合化吸着では単独吸着に比べて約30%程増大することが見出された。この結果を反映して、光電変換効率も同様の増大と変化を示した。また太陽電池デバイスにおける並列抵抗成分は、複合吸着の場合に減少することがわかった。これはCdSe量子ドットとAu量子ドットの直接接触による影響と考えられる。他の評価として、単独吸着の場合と複合化吸着の場合の超高速過渡応答特性の検討を行った。その結果、複合化吸着の場合は単独吸着の場合と比較して、緩和時間が長くなる傾向が見られた。, 21020014
2009 - 2010

ナノ材料及びその製造方法、量子ドット液並びに光素子
Patent right, 沈 青, Wichaiyo Napasuda, 魏玉瑶, 早瀬 修二, 特願2025-035114, Date applied: 06 Mar. 2025

量子ドットの作製方法、発光素子及びその製造方法、並びにナノ素材
Patent right, 沈 青 , 戸佐 圭汰 , 早瀬 修二 , 陳 世凱 , 李 玉勝, 特願2025-010927, Date applied: 24 Jan. 2025

ハロゲン化ペロブスカイト型太陽電池、ハロゲン化ペロブスカイト型太陽電池の
Patent right, 早瀬 修二, 沈 青, ワン リャン, 特願PCT/JP2024/035112, Date applied: 01 Oct. 2024

Production method of methylammonium lead halide perovskite quantum dots
Patent right, Taizo Masuda, Qing Shen, Chao Ding, Yaohong Zhang, Feng Liu, 特願17218681, 特開11479718, Date announced: 22 Sep. 2022, Taizo Masuda, Qing Shen, Chao Ding, Yaohong Zhang, Feng Liu

ホルムアミジニウムハロゲン化鉛ペロブスカイト量子ドットの調製方法
Patent right, 増田泰造, 佐々木清人, 沈青, 劉鋒, 張耀紅, 丁超, 201910427519.0, Date applied: 22 May 2019, Toyota Motor Corporation

量子ドット、これを用いた光デバイス、及び量子ドットの作製方法
Patent right, 劉鋒, 沈青, 張耀紅, 豊田太郎, 特願2017-057431, Date applied: 23 Mar. 2017, 国立大学法人電気通信大学

電通大など、量子ドット太陽電池で変換効率15%超
日経経済新聞, https://www.nikkei.com/prime/tech-foresight/article/DGXZQOUC10A2B0Q2A111C2000000
Nov. 2022

電通大、量子ドット太陽電池にて変換効率15.45％を達成
マイナビニュース, https://www.mapion.co.jp/news/column/cobs2498481-1-all/
Oct. 2022

電通大，量子ドット太陽電池で最高変換効率達成
Optronics online, https://optronics-media.com/news/20221019/78991/, Internet
Oct. 2022

電通大、量子ドット太陽電池にて変換効率15.45％を達成
TECH+ テクノロジー 環境技術, https://news.mynavi.jp/techplus/article/20221020-2485731/, Internet
Oct. 2022

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神奈川新聞(Kanagawa-ken), http://kanagawa-ken.com/energy/24071/

【ニュースリリース】硫化鉛量子ドット太陽電池の世界最高性能を達成
Internet

JSAP-MRS Joint Symposium: New direction of perovskite solar cells
Planning etc, 16 Sep. 2024 - 16 Sep. 2024