Cascaded energy landscape as a key driver for slow yet efficient charge separation with small energy offset in organic solar cells

Shin-ichiro Natsuda, Toshiharu Saito, Rei Shirouchi, Yuji Sakamoto, Taiki Takeyama, Yasunari Tamai and Hideo Ohkita

Energy Environ. Sci., 2022, 15, 1545
DOI: 10.1039/D1EE03565G

Effects of non-fused and fused substituents in quinoxaline-based central units on conformation, aggregation, and photovoltaic properties of non-fused ring electron acceptors

Kenta Yamada, Wataru Suzuki, Motohisa Kubota, Junichi Inamoto, Mizuho Kondo, Tomoyuki Koganezawa, Yuki Chiga, Ryo Takahata, Toshiharu Teranishi, Hiroshi Imahori and Tomokazu Umeyama

J. Mater. Chem. C, 2025, 13, 7984
DOI: 10.1039/D5TC00204D

Terminal groups play an important role in enhancing the performance of organic solar cells based on non-fused electron acceptors

Fengting Li, Xin-Heng Fan, Cai-Yan Gao and Lian-Ming Yang

New J. Chem., 2022, 46, 10048
DOI: 10.1039/D2NJ01108E

Charge separation boosts exciton diffusion in fused ring electron acceptors

Junyi Liu, Zi Li, Jiayu Wang, Xu Zhang, Xiaowei Zhan and Gang Lu

J. Mater. Chem. A, 2020, 8, 23304
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Role of the energy offset in the charge photogeneration and voltage loss of nonfullerene acceptor-based organic solar cells

Yasunari Tamai, Rei Shirouchi, Toshiharu Saito, Kazuki Kohzuki and Shin-ichiro Natsuda

J. Mater. Chem. A, 2023, 11, 17581
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Mitigating triplet loss in 2D WSe2/non-fullerene heterostructures using halogenated acceptors

Sreelakshmi Chandrabose, Ana M. Valencia, Meysam Raoufi, Nisreen Alshehri, Tracey M. Clarke, Frédéric Laquai, Caterina Cocchi and Dieter Neher

Mater. Horiz., 2025, 12, 2656
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Decomposition analysis on the excitation behaviors of thiazolothiazole (TTz)-based dyes via the time-dependent dielectric density functional theory approach

Takumi Naito, Yukiumi Kita, Tomomi Shimazaki and Masanori Tachikawa

RSC Adv., 2022, 12, 34685
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Boosting charge separation in organic photovoltaics: unveiling dipole moment variations in excited non-fullerene acceptor layers

Akira Yamakata, Kosaku Kato, Takumi Urakami, Sota Tsujimura, Kasumi Murayama, Masahiro Higashi, Hirofumi Sato, Yasuhiro Kobori, Tomokazu Umeyama and Hiroshi Imahori

Chem. Sci., 2024, 15, 12686
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Stereoisomer resolution of 2-ethylhexyl-substituted cyclopentadithiophene and its effect on optical properties of donor–acceptor–donor conjugated molecules

Kenta Yamada, Wataru Suzuki, Jun-ichi Nishida, Masayuki Gon, Kazuo Tanaka and Tomokazu Umeyama

Chem. Commun., 2025, 61, 13401
DOI: 10.1039/D5CC02779A

Prolongation of the singlet exciton lifetime of nonfullerene acceptor films by the replacement of the central benzene core with naphthalene

Tomokazu Umeyama, Kensho Igarashi, Yasunari Tamai, Tatsuho Wada, Taiki Takeyama, Daiki Sasada, Keiichi Ishida, Tomoyuki Koganezawa, Shunsuke Ohtani, Kazuo Tanaka, Hideo Ohkita and Hiroshi Imahori

Sustainable Energy Fuels, 2021, 5, 2028
DOI: 10.1039/D0SE01861A

Energy migration, charge transfer, and charge dissociation in self-assembling nonfullerene acceptor aggregates with zincporphyrin-nonfullerene acceptor dyads

Yasunari Tamai, Midori Akiyama, Lorenzo Vallan, Daiki Sasada, Katsuaki Suzuki, Hironori Kaji, Takumi Urakami, Hirofumi Sato, Masahiro Higashi, Seiichiro Izawa, Motohisa Kubota, Tomokazu Umeyama and Hiroshi Imahori

Chem. Sci., 2025, 16, 15378
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Photoinduced charge separation at heterojunctions between two-dimensional layered materials and small organic molecules

Hiroshi Imahori and Midori Akiyama

Mater. Horiz., 2025, 12, 92
DOI: 10.1039/D4MH01296H

Synthesis and Photovoltaic Properties of Non-Fullerene Acceptors with Quinoxaline-Based Central Unit

Tomokazu Umeyama, Kaho Yasuzato, Seiya Sugiura, Kenta Yamada, Junichi Inamoto, Shunjiro Fujii and Wataru Suzuki

J. Photopol. Sci. Technol., 2025, 38, 197
DOI: 10.2494/photopolymer.38.197

Role of Energy Offset in Nonradiative Voltage Loss in Organic Solar Cells

Toshiharu Saito, Shin-ichiro Natsuda, Kenta Imakita, Yasunari Tamai and Hideo Ohkita

Solar RRL, 2020, 4
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Molecular Photoinduced Charge Separation: Fundamentals and Application

Hiroshi Imahori

Bulletin of the Chemical Society of Japan, 2023, 96, 339
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Interexcited State Photophysics II: A Qualitative Excited State Dynamics Model from First-Principles

Anjay Manian, Jessica M. de la Perrelle, Rohan J. Hudson, Zi Goh, Trevor A. Smith, Tak W. Kee and Salvy P. Russo

J. Chem. Theory Comput., 2025, 21, 4051
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Delocalization suppresses nonradiative charge recombination in polymer solar cells

Shin-ichiro Natsuda, Toshiharu Saito, Rei Shirouchi, Kenta Imakita and Yasunari Tamai

Polym J, 2022, 54, 1345
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Efficient Exciton Diffusion in Micrometer-Sized Domains of Nanographene-Based Nonfullerene Acceptors with Long Exciton Lifetimes in Blend Films with Conjugated Polymer

Tomokazu Umeyama, Kensho Igarashi, Daiki Sasada, Keiichi Ishida, Tomoyuki Koganezawa, Shunsuke Ohtani, Kazuo Tanaka and Hiroshi Imahori

ACS Appl. Mater. Interfaces, 2020, 12, 39236
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Singlet and Triplet Excited-State Dynamics of a Nonfullerene Electron Acceptor Y6

Shin-ichiro Natsuda, Yuji Sakamoto, Taiki Takeyama, Rei Shirouchi, Toshiharu Saito, Yasunari Tamai and Hideo Ohkita

J. Phys. Chem. C, 2021, 125, 20806
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Triplet sensitization via charge recombination at organic heterojunction for efficient near-infrared to visible solid-state photon upconversion

Yuji Sakamoto, Seiichiro Izawa, Hideo Ohkita, Masahiro Hiramoto and Yasunari Tamai

Commun Mater, 2022, 3
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Unfused vs fused thienoazacoronene-cored perylene diimide oligomer based acceptors for non-fullerene organic solar cells

Xiaoxiao You, Ping Xia, Yu Li, Di Wu and Jianlong Xia

Dyes and Pigments, 2021, 196, 109833
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Revealing Intrinsic Free Charge Generation: Promoting the Construction of Over 19% Efficient Planar p‐n Heterojunction Organic Solar Cells

Junjie Wang, Yonghai Li, Fuzhen Bi, Chunpeng Yang, Maria Vasilopoulou, Junhao Chu and Xichang Bao

Angew Chem Int Ed, 2025, 64
DOI: 10.1002/anie.202417143

Revealing Intrinsic Free Charge Generation: Promoting the Construction of Over 19% Efficient Planar p‐n Heterojunction Organic Solar Cells

Junjie Wang, Yonghai Li, Fuzhen Bi, Chunpeng Yang, Maria Vasilopoulou, Junhao Chu and Xichang Bao

Angewandte Chemie, 2025, 137
DOI: 10.1002/ange.202417143

Manipulation of Charge-Transfer States by Molecular Design: Perspective from “Dynamic Exciton”

Hiroshi Imahori, Yasuhiro Kobori and Hironori Kaji

Acc. Mater. Res., 2021, 2, 501
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Incorporation of selenophene into thienoazacoronene-based nonfullerene acceptor: impact on photophysical and photovoltaic properties

Motohisa Kubota, Tomokazu Umeyama, Wataru Suzuki, Tomoyuki Koganezawa, Midori Akiyama and Hiroshi Imahori

Bulletin of the Chemical Society of Japan, 2025, 98
DOI: 10.1093/bulcsj/uoae147

All-Atom Nonadiabatic Semiclassical Mapping Dynamics for Photoinduced Charge Transfer of Organic Photovoltaic Molecules in Explicit Solvents

Zhubin Hu and Xiang Sun

J. Chem. Theory Comput., 2022, 18, 5819
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Photovoltaic performance optimization of integrated perovskite/organic solar cells based on PM6:Y6 polymer non-fullerene system

Jing Meng and Bo-Wen Gao

Acta Phys. Sin., 2023, 72, 128801
DOI: 10.7498/aps.72.20230081

P‐type Semiconducting Polymers as Photocathodes: A Comparative Study for Optobioelectronics

Luca Bondi, Camilla Marzuoli, Edgar Gutiérrez‐Fernández, Gabriele Tullii, Jaime Martín, Beatrice Fraboni, David Mecerreyes, Maria Rosa Antognazza and Tobias Cramer

Adv Elect Materials, 2023, 9
DOI: 10.1002/aelm.202300146

Numerical investigation of PBDB-T:INTIC based bulk heterojunction organic solar cell with graphene derivatives as HTL

Denet Davis and K.S. Sudheer

Results in Surfaces and Interfaces, 2025, 19, 100474
DOI: 10.1016/j.rsurfi.2025.100474

Alkoxy-Substituted Quadrupolar Fluorescent Dyes

Yuanning Feng, Partha Jyoti Das, Ryan M. Young, Paige J. Brown, Jessica E. Hornick, Jacob A. Weber, James S. W. Seale, Charlotte L. Stern, Michael R. Wasielewski and J. Fraser Stoddart

J. Am. Chem. Soc., 2022, 144, 16841
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Development of Non-Fullerene Acceptors with π-Extended Central Unit for Organic Photovoltaic Devices

Tomokazu Umeyama, Motohisa Kubota, Haoxuan Zhang, Rintaro Adachi, Akira Yamakata, Tomoyuki Koganezawa and Hiroshi Imahori

J. Photopol. Sci. Technol., 2024, 37, 197
DOI: 10.2494/photopolymer.37.197

Charge Transfer and Level Lifetime in Molecular Photon-Absorption upon the Quantum Impedance Lorentz Oscillator

Qi-Qi Bai, Zheng-Ji Fang, Xiao-Feng Wang, Yong Zhang, Xing-Hua Zhao and Pei-De Zhao

ACS Omega, 2023, 8, 19950
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Elucidating the origin of open‐circuit voltage in ternary organic solar cells with a nonfullerene and a fullerene acceptor

Dominic Blätte, Marcella Günther, Carlito S. Ponseca, Andreas Weis, Rik Hooijer, Lucie Quincke, Miguel A. T. Cachafeiro, Wolfgang Tress, Jose D. Perea, Salvador Leon, Ali Shuaib, Pavel Chabera, Tönu Pullerits, Thomas Bein and Tayebeh Ameri

InfoMat, 2026, 8
DOI: 10.1002/inf2.70109

Effect of Terminal-Group Halogenation of Naphthalene-Based Nonfullerene Acceptors on Their Film Structure and Photophysical and Photovoltaic Properties

Tomokazu Umeyama, Tatsuho Wada, Kensho Igarashi, Kosaku Kato, Akira Yamakata, Taiki Takeyama, Yuji Sakamoto, Yasunari Tamai, Hideo Ohkita, Keiichi Ishida, Tomoyuki Koganezawa, Shunsuke Ohtani, Kazuo Tanaka and Hiroshi Imahori

ACS Appl. Energy Mater., 2021, 4, 14022
DOI: 10.1021/acsaem.1c02816

Efficient Hole Transfer via Delocalized Excited State in Small Molecular Acceptor: A Comparative Study on Photodynamics of PM6:Y6 and PM6:ITIC Organic Photovoltaic Blends

Shuyan Liang, Siying Li, Yannan Zhang, Tao Li, Haoxiang Zhou, Feng Jin, Chuanxiang Sheng, Gang Ni, Jianyu Yuan, Wanli Ma and Haibin Zhao

Adv Funct Materials, 2021, 31
DOI: 10.1002/adfm.202102764

Band-like transport in non-fullerene acceptor semiconductor Y6

Kaixuan Chen, Huan Wei, Ping-An Chen, Yu Liu, Jing Guo, Jiangnan Xia, Haihong Xie, Xincan Qiu and Yuanyuan Hu

Front. Optoelectron., 2022, 15
DOI: 10.1007/s12200-022-00019-2

Charge generation in organic solar cells: Journey toward 20% power conversion efficiency

Yasunari Tamai

Aggregate, 2022, 3
DOI: 10.1002/agt2.280

The Photopolymer Science and Technology Award

Tomokazu Umeyama, Motohisa Kubota, Haoxuan Zhang, Rintaro Adachi, Akira Yamakata, Tomoyuki Koganezawa and Hiroshi Imahori

J. Photopol. Sci. Technol., 2025, 38, 7
DOI: 10.2494/photopolymer.38.7

Periodically Twisted Molecular Wires Based on a Fused Unit for Efficient Intramolecular Hopping Transport

Ryo Asakawa, Soichi Yokoyama, Ryo Yamada, Seiya Maeda, Tatsuhiko Ohto, Hirokazu Tada and Yutaka Ie

J. Am. Chem. Soc., 2024, 146, 23529
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Intrinsic Advantage of Fused‐Ring Nonfullerene Acceptor‐Based Organic Solar Cells to Reduce Voltage Loss

Toshiharu Saito, Shin-ichiro Natsuda, Rei Shirouchi, Kenta Imakita, Kazuki Kohzuki and Yasunari Tamai

Physica Status Solidi (a), 2023, 220
DOI: 10.1002/pssa.202300121

What's Next for Organic Solar Cells? The Frontiers and Challenges

Yasunari Tamai

Adv Energy and Sustain Res, 2023, 4
DOI: 10.1002/aesr.202200149

π-conjugated molecule Y6 combined with an electron sacrificial agent boosts photodynamic therapy via enhanced glutathione photooxidation

Zhimin Gao, Qian Zhang, Ziyan Huang, Feng Jin, Yongxin Huang, Xinyi Wang, Chen Lin, Guokang Chen, Chuanlong Wu, Fangwei Zhang, Wei Chen, Jiajia Wang and Zhiyao Hou

Precision Medicine and Engineering, 2026, 3, 100066
DOI: 10.1016/j.preme.2026.100066

Modeling Quantum Dot Systems as Random Geometric Graphs with Probability Amplitude-Based Weighted Links

Lucas Cuadra and José Carlos Nieto-Borge

Nanomaterials, 2021, 11, 375
DOI: 10.3390/nano11020375

Exciton Delocalization Counteracts the Energy Gap: A New Pathway toward NIR-Emissive Dyes

Alexei Cravcenco, Yi Yu, Fredrik Edhborg, Jonas F. Goebel, Zoltan Takacs, Yizhou Yang, Bo Albinsson and Karl Börjesson

J. Am. Chem. Soc., 2021, 143, 19232
DOI: 10.1021/jacs.1c10654

Computational Insights into Excited State Properties of Donor/Acceptor Composites Featuring Tetrathiafulvalene and Nanographenes

Kiruthika Samuthirapandi, Durga Mukkonathil and Sunandan Sarkar

Chemistry An Asian Journal, 2026, 21
DOI: 10.1002/asia.70612

An Effective D-π-A Type Donor Material Based on 4-Fluorobenzoylacetonitrile Core Unit for Bulk Heterojunction Organic Solar Cells

Shabaz Alam, M. Shaheer Akhtar, Abdullah, Eun-Bi Kim, Hyung-Shik Shin and Sadia Ameen