Regioregular Non-Fused Polymerized Small Molecular Acceptors Enabling Efficient All-Polymer Solar Cells  

作　　者：Baoqi Wu Youle Li Shizeng Tian Yue Zhang Langheng Pan Kangzhe Liu Mingqun Yang Fei Huang Yong Cao Chunhui Duan 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou,Guangdong,510640 China

出　　处：《Chinese Journal of Chemistry》2023年第7期790-796,共7页中国化学（英文版）

基　　金：supported by the Ministry of Science and Technology of China(2019YFA0705900);the National Natural Science Foundation of China(21875072,22275058,and U20A6002);Guangdong Innovative and Entrepreneurial Research Team Program(2019ZT08L075).

摘　　要：Comprehensive Summary The regioregularity induced by the isomers of the end-groups has been widely recognized as a key factor that determines the photovoltaic properties of polymerized small molecular acceptors(PSMAs)in all-polymer solar cells(all-PSCs).However,the influence of regioregularity on the photovoltaic properties of non-fused PSMAs has not been explored yet.In this contribution,two regioregular non-fused PSMAs,PFBTz-T-γand PFBTz-T-δ,were synthesized for the first time by using the monomers with isomeric pure end-groups.Compared with PFBTz-T-δ,PFBTz-T-γhas more compact and more ordered packing in solid state,which results in a more red-shifted optical absorption and a higher electron mobility.More remarkably,PFBTz-T-γand PFBTz-T-δexhibited huge difference in photovoltaic performance in all-PSCs,which offered the power conversion efficiencies(PCEs)of 9.72%and 0.52%,respectively.Further studies have unveiled that the higher PCE of PFBTz-T-γis due to more efficient exciton dissociation,higher and more balanced electron/hole mobility,and less charge recombination as a result of favorable morphology of the blend film.This work demonstrates that the development of regioregular non-fused PSMAs by tuning the polymerization sites is an effective strategy for obtaining high-efficiency all-PSCs.

关 键 词：All-polymer solar cells Non-fused framework Polymer acceptors REGIOREGULARITY Morphology regulation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]