@article{a5f3cb074a854fe185f612ab96e8b237,
title = "Double Asymmetric Core Optimizes Crystal Packing to Enable Selenophene-based Acceptor with Over 18 % Efficiency in Binary Organic Solar Cells",
abstract = "Side-chain tailoring is a promising method to optimize the performance of organic solar cells (OSCs). However, asymmetric alkyl chain-based small molecular acceptors (SMAs) are still difficult to afford. Herein, we adopted a novel asymmetric n-nonyl/undecyl substitution strategy and synthesized two A-D1A′D2-A double asymmetric isomeric SMAs with asymmetric selenophene-based central core for OSCs. Crystallographic analysis indicates that AYT9Se11-Cl forms a more compact and order intermolecular packing compared to AYT11Se9-Cl, which contributed to higher electron mobility in neat AYT9Se11-Cl film. Moreover, the PM6 : AYT9Se11-Cl blend film shows a better morphology with appropriate phase separation and distinct face-on orientation than PM6 : AYT11Se9-Cl. The OSCs with PM6 : AYT9Se11-Cl obtain a superior PCE of 18.12 % compared to PM6 : AYT11Se9-Cl (17.52 %), which is the best efficiency for the selenium-incorporated SMAs in binary BHJ OSCs. Our findings elucidate that the promising double asymmetric strategy with isomeric alkyl chains precisely modulates the crystal packing and enhances the photovoltaic efficiency of selenophene-incorporated SMAs.",
keywords = "Asymmetric Strategy, Organic Solar Cells, Selenophene Substitution, Single Crystal Analysis, Small Molecular Acceptor",
author = "Xin Zhao and Qiaoshi An and Heng Zhang and Can Yang and Asif Mahmood and Mengyun Jiang and Jee, {Min Hun} and Bin Fu and Shiyu Tian and Woo, {Han Young} and Yapei Wang and Wang, {Jin Liang}",
note = "Funding Information: This work was financially supported by grants from the Natural Science Foundation of China (No. 21971014 and 22275017). Prof. Jin‐Liang Wang was supported by the Thousand Youth Talents Plan of China and BIT Teli Young Fellow Recruitment Program. Xin Zhao thanks Prof. Qiaoshi An for devices preparation, optimization and characterization. Xin Zhao thanks Prof. Jin‐Liang Wang for the single‐crystal preparation and measurement and for revising this paper. Xin Zhao thanks Heng Zhang for the help on some supplemental experiments and discussions in this paper. Xin Zhao thanks Lu Yan, Hong‐Fu Zhi, and Hai‐Rui Bai for the help on devices characterization. Xin Zhao thanks Shiyu Tian, Haoyu Fulv and Pengbo Gao for the synthesis of precursors. The authors also thank Prof. Xiong Li (Beijing Technology and Business University) for the help on the TPV and TPC experiments. The authors gratefully acknowledge the Analysis & Testing Center, Beijing Institute of Technology, for NMR, TGA, AFM, devices preparation, and characterization. The authors gratefully acknowledge the Analysis & Testing Center of the School of Chemistry and Chemical Engineering, Beijing Institute of Technology, for DSC characterization. Funding Information: This work was financially supported by grants from the Natural Science Foundation of China (No. 21971014 and 22275017). Prof. Jin-Liang Wang was supported by the Thousand Youth Talents Plan of China and BIT Teli Young Fellow Recruitment Program. Xin Zhao thanks Prof. Qiaoshi An for devices preparation, optimization and characterization. Xin Zhao thanks Prof. Jin-Liang Wang for the single-crystal preparation and measurement and for revising this paper. Xin Zhao thanks Heng Zhang for the help on some supplemental experiments and discussions in this paper. Xin Zhao thanks Lu Yan, Hong-Fu Zhi, and Hai-Rui Bai for the help on devices characterization. Xin Zhao thanks Shiyu Tian, Haoyu Fulv and Pengbo Gao for the synthesis of precursors. The authors also thank Prof. Xiong Li (Beijing Technology and Business University) for the help on the TPV and TPC experiments. The authors gratefully acknowledge the Analysis & Testing Center, Beijing Institute of Technology, for NMR, TGA, AFM, devices preparation, and characterization. The authors gratefully acknowledge the Analysis & Testing Center of the School of Chemistry and Chemical Engineering, Beijing Institute of Technology, for DSC characterization. Publisher Copyright: {\textcopyright} 2023 Wiley-VCH GmbH.",
year = "2023",
month = mar,
day = "1",
doi = "10.1002/anie.202216340",
language = "English",
volume = "62",
journal = "Angewandte Chemie - International Edition",
issn = "1433-7851",
publisher = "John Wiley and Sons Ltd",
number = "10",
}
