Enhancing Photovoltaic Performance of Asymmetric Fused-Ring Electron Acceptor by Expanding Pyrrole to Pyrrolo[3,2-b]pyrrole  

作　　者：Zemin Wang Guilong Cai Peiyao Xue Zesheng Liu Boyu Jia Nan Li Jiayu Wang Xinhui Lu Yuze Lin Guojie Wang Xiaowei Zhan 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083 China [2]Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,School of Materials Science and Engineering,Peking University,Beijing,100871 China [3]Department of Physics,The Chinese University of Hong Kong,New Territories,999077 Hong Kong,China [4]Chinese Academy of Sciences,Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Beijing,100190 China

出　　处：《Chinese Journal of Chemistry》2022年第24期2861-2866,共6页中国化学（英文版）

基　　金：X.Z.thanks the NSFC(No.U21A20101).

摘　　要：We propose a strategy to improve performance of unidirectionally extended fused-ring electron acceptors by using pyrrolo[3,2-b]pyrrole to replace pyrrole ring, and design two asymmetric nonfullerene acceptors 1PIC and 2PIC. Replacing pyrrole in 1PIC with pyrrolo[3,2-b]pyrrole remarkably red-shifts absorption peak by 109 nm, elevates the HOMO and LUMO energy levels, and improves electron mobility. The photovoltaic devices based on blend of PM6 donor and 2PIC acceptor exhibit power conversion efficiency as high as 12.6%, which is much higher than that of PM6:1PIC (3.53%), due to more efficient exciton generation and dissociation, faster and more balanced carrier transport and less charge recombination.

关 键 词：Energy conversion Fused-ring electron acceptor Pyrrolo[3 2-b]pyrrole Asymmetric synthesis SEMICONDUCTORS 

分 类 号：O62[理学—有机化学]