A Halogenation Strategy for over 12% Efficiency Nonfullerene Organic Solar Cells |
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| Authors: | Yanbo Wang Yamin Zhang Nailiang Qiu Huanran Feng Huanhuan Gao Bin Kan Yanfeng Ma Chenxi Li Xiangjian Wan Yongsheng Chen |
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| Affiliation: | State Key Laboratory and Institute of Elemento‐Organic Chemistry, Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, China |
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| Abstract: | Three acceptor–donor–acceptor type nonfullerene acceptors (NFAs), namely, F–F, F–Cl, and F–Br, are designed and synthesized through a halogenation strategy on one successful nonfullerene acceptor FDICTF (F–H). The three molecules show red‐shifted absorptions, increased crystallinities, and higher charge mobilities compared with the F–H. After blending with donor polymer PBDB‐T, the F–F‐, F–Cl‐, and F–Br‐based devices exhibit power conversion efficiencies (PCEs) of 10.85%, 11.47%, and 12.05%, respectively, which are higher than that of F–H with PCE of 9.59%. These results indicate that manipulating the absorption range, crystallinity and mobilities of NFAs by introducing different halogen atoms is an effective way to achieve high photovoltaic performance, which will offer valuable insight for the designing of high‐efficiency organic solar cells. |
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| Keywords: | absorption crystallinity nonfullerene acceptors organic solar cells |
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