Revisiting the Bithiophene Imide-Based Polymer Donors: Molecular Aggregation and Orientation Control Enabling New Polymer Donors for High-Performance All-Polymer Solar Cells  

作　　者：Jie Yang Bin Liu Jin-Woo Lee Yimei Wang Huiliang Sun Zhicai Chen Qingqing Bai Bumjoon J.Kim Yan Jiang Li Niu Xugang Guo 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology(SUSTech),No.1088,Xueyuan Road,Shenzhen,Guangdong,518055 China [2]Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou,Guangdong,510006 China [3]Energy Materials and Optoelectronics Unit,Songshan Lake Materials Laboratory,Dongguan,Guangdong,523808 China [4]Department of Chemical and Biomolecular Engineering,Korea Advanced Institute of Science and Technology(KAIST),Daejeon,34141 Republic of Korea

出　　处：《Chinese Journal of Chemistry》2022年第24期2900-2908,I0002,共10页中国化学（英文版）

基　　金：support from the Songshan Lake Mate-rials Laboratory(2021SLABFK03);This work is supported by the National Natural Science Foundation of China(52173172,52173171,and 21801124);the Natural Science Foundation for Distinguished Young Scholars of Guangdong Province(2021B1515020027);the Guangdong Basic and Applied Basic Research Foundation(2021A1515110892);the China Postdoctoral Science Foundation(2021M700062);the Shenzhen Science and Technology Innovation Commission JCYJ202103243104813035 and JCYJ20180504165709042);the Open Fund of the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology).

摘　　要：Bithiophene imide (BTI)-based polymers have been promising photovoltaic materials due to their high mobility and tunable energy levels. However, BTI polymers have rarely been revisited since organic solar cells (OSCs) entered the era of non-fullerene electron acceptors (NFEA) likely owing to their incompatibility with NFEAs. Herein, fine-tuning the aggregation and orientation of BTI-based donor-π-acceptor (D-π-A) polymer donors was achieved by incorporating the linear n-octyl group into thiophene π-bridge. The resulting polymer donor G15 shows excellent compatibility with NFEA L15 (polymer acceptor). The G15-based all-polymer OSCs achieve high power conversion efficiency of 15.17%. This is significantly higher than that (< 5%) of its analogue with isomerized branched alkyl chains and also among the highest values for all-polymer OSCs. The results highlight that well-tailored BTI polymer donors are attractive photovoltaic materials for further exploration in non-fullerene organic solar cells.

关 键 词：Bithiophene imide Molecular orientation ISOMERIZATION Polymer donors All-polymer solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]