Fused Hexacyclic Nonfullerene Acceptor with Strong Near‐Infrared Absorption for Semitransparent Organic Solar Cells with 9.77% Efficiency |
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| Authors: | Wei Wang Cenqi Yan Tsz‐Ki Lau Jiayu Wang Kuan Liu Yan Fan Xinhui Lu Xiaowei Zhan |
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| Affiliation: | 1. Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing, China;2. Department of Physics, Chinese University of Hong Kong, New Territories, Hong Kong, China |
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| Abstract: | A fused hexacyclic electron acceptor, IHIC, based on strong electron‐donating group dithienocyclopentathieno3,2‐b ]thiophene flanked by strong electron‐withdrawing group 1,1‐dicyanomethylene‐3‐indanone, is designed, synthesized, and applied in semitransparent organic solar cells (ST‐OSCs). IHIC exhibits strong near‐infrared absorption with extinction coefficients of up to 1.6 × 105m ?1 cm?1, a narrow optical bandgap of 1.38 eV, and a high electron mobility of 2.4 × 10?3 cm2 V?1 s?1. The ST‐OSCs based on blends of a narrow‐bandgap polymer donor PTB7‐Th and narrow‐bandgap IHIC acceptor exhibit a champion power conversion efficiency of 9.77% with an average visible transmittance of 36% and excellent device stability; this efficiency is much higher than any single‐junction and tandem ST‐OSCs reported in the literature. |
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| Keywords: | dithienocyclopentathieno[3 2‐b]thiophene fused‐ring electron acceptors near‐infrared absorption nonfullerene acceptors organic solar cells |
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