Single‐Junction Binary‐Blend Nonfullerene Polymer Solar Cells with 12.1% Efficiency |
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| Authors: | Fuwen Zhao Shuixing Dai Yang Wu Qianqian Zhang Jiayu Wang Li Jiang Qidan Ling Zhixiang Wei Wei Ma Wei You Chunru Wang 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. Institute of Chemistry, Chinese Academy of Sciences, Beijing, China;3. Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University, Fuzhou, China;4. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China;5. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;6. National Center for Nanoscience and Technology, Beijing, China |
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| Abstract: | A new fluorinated nonfullerene acceptor, ITIC‐Th1, has been designed and synthesized by introducing fluorine (F) atoms onto the end‐capping group 1,1‐dicyanomethylene‐3‐indanone (IC). On the one hand, incorporation of F would improve intramolecular interaction, enhance the push–pull effect between the donor unit indacenodithieno[3,2‐b]thiophene and the acceptor unit IC due to electron‐withdrawing effect of F, and finally adjust energy levels and reduce bandgap, which is beneficial to light harvesting and enhancing short‐circuit current density (J SC). On the other hand, incorporation of F would improve intermolecular interactions through C? F···S, C? F···H, and C? F···π noncovalent interactions and enhance electron mobility, which is beneficial to enhancing J SC and fill factor. Indeed, the results show that fluorinated ITIC‐Th1 exhibits redshifted absorption, smaller optical bandgap, and higher electron mobility than the nonfluorinated ITIC‐Th. Furthermore, nonfullerene organic solar cells (OSCs) based on fluorinated ITIC‐Th1 electron acceptor and a wide‐bandgap polymer donor FTAZ based on benzodithiophene and benzotriazole exhibit power conversion efficiency (PCE) as high as 12.1%, significantly higher than that of nonfluorinated ITIC‐Th (8.88%). The PCE of 12.1% is the highest in fullerene and nonfullerene‐based single‐junction binary‐blend OSCs. Moreover, the OSCs based on FTAZ:ITIC‐Th1 show much better efficiency and better stability than the control devices based on FTAZ:PC71BM (PCE = 5.22%). |
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| Keywords: | fluorination fused‐ring electron acceptors nonfullerene polymer solar cells |
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