Enhancing the Intrinsic Stability of Nonfullerene Acceptors through Dimerization via Ring-locking Strategy  

作　　者：Yaxin He Ji Wan Xianglang Sun Jie Min Zhong’an Li 

机构地区：[1]Key Laboratory for Material Chemistry of Energy Conversion and Storage,Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,Hubei,430074 China [2]The Institute for Advanced Studies,Wuhan University,Wuhan,Hubei,430072 China

出　　处：《Chinese Journal of Chemistry》2025年第6期641-649,共9页中国化学(英文版)

基　　金：the National Natural Science Foundation of China(Grant No.22175067).

摘　　要：Comprehensive Summary The power conversion efficiencies(PCEs)of non-fullerene acceptor(NFA)-based organic solar cells(OSCs)have undergone an exciting development in recent years,but the poor intrinsic stability of exocyclic ethylene bridges in NFAs poses a significant challenge to their commercialization.In this work,we propose a new pyran-locking strategy that can stabilize the exocyclic ethylene bridge connecting the strong electron-deficient 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end group,based on which two dimerized NFAs(ITBIC-F and TBTBIC-F)with an A-D-π-A-π-D-A structure have been successfully synthesized with significantly improved chemical and photochemical stabilities in comparison with traditional NFAs without the ring-locked structure.The ITBIC-F and TBTBIC-F-based OSCs not only achieve promising PCEs of 13.03%and 10.01%,respectively,but also show good device stability;the ITBIC-F-based unencapsulated devices can retain 75%and 62%of their initial PCEs,respectively,under continuous heat(85°C)and light irradiation(LED,100 mW·cm^(–2))in a nitrogen atmosphere.

关 键 词：Organic solar cells Electron acceptors Intrinsic stability Ring-locking strategy Photovoltaic properties 

分 类 号：TM914.4[电气工程—电力电子与电力传动]