A New Nonfullerene Acceptor with Suppressed Energy Disorder for High-Efficiency Organic Solar Cells  

作　　者：Zi Li Huifeng Yao Zhihao Chen Wenxuan Wang Yang Xiao Jianqiu Wang Junzhen Ren Tao Zhang Jiayao Li Jianhui Hou 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190 [2]School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189 [3]University of Chinese Academy of Sciences,Beijing 100049

出　　处：《CCS Chemistry》2024年第11期2749-2757,共9页中国化学会会刊（英文）

基　　金：funded by the National Natural Science Foundation of China(grant nos.22122905,22075301,and 52120105005);H.Yao was supported by the Startup Research Fund of Southeast University(grant no.RF1028623263).

摘　　要：Energy disorder is an important factor that affects charge transport,recombination,and energy loss in organic solar cells.Here,we designed a ladder-type nonfullerene acceptor and studied the critical role of energy disorder in photovoltaic performance.Taking a typical seven-member fused ring acceptor IT-4F as an example,we replaced its sp3-hybridized bridging carbon atoms and linked bulky groups with triisopropylbenzene-substituted pyrrole units.The newly synthesized acceptor 2,2′-((2Z,2′Z)-((3,9-bis(2-butyloctyl)-6,12-bis(2,4,6-triisopropylphenyl)-6,12-dihydrothieno[2″,3″:4′,5′]thieno[2′,3′:4,5]pyrrolo[2,3-f]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,8-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(TBB)has a redshifted absorption spectrum with upshifted energy levels than those of IT-4F.More importantly,TBB shows more suppressed energy disorder,which leads to enhanced charge mobility and improved luminescence efficiency.Consequently,TBB-based devices obtained a power conversion efficiency of 16.2%with a relatively low nonradiative energy loss(0.22 eV),which exceeds that of IT-4F-based devices(11.5%)and is one of the top values among non-Y6 systems.This work demonstrates that rational molecular design is crucial for the suppression of energy disorder.

关 键 词：organic solar cells nonfullerene acceptors energy disorder energy loss photoactive materials 

分 类 号：O62[理学—有机化学]