High-Performance D-A Copolymer Donor Based on Difluoroquinoxaline A-Unit with Alkyl-Chlorothiophene Substituents for Polymer Solar Cells  

作　　者：Can Zhu Ke Hu Lei Meng Xiaolei Kong Wenbin Lai Shucheng Qin Beibei Qiu Jinyuan Zhang Zhanjun Zhang Yilei Wu Xiaojun Li Yongfang Li 

机构地区：[1]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190 [2]School of Chemical Science,University of Chinese Academy of Sciences,Beijing 100049 [3]Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province,College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua,Zhejiang 321004 [4]Department of Chemical Engineering,Stanford University,Stanford,California 94305-4125 [5]Laboratory of Advanced Optoelectronic Materials,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou,Jiangsu 215123

出　　处：《CCS Chemistry》2023年第10期2378-2388,共11页中国化学会会刊（英文）

基　　金：supported by National Key Research and Development Program of China(grant no.2019YFA0705900)funded by MOST,the National Natural Science Foundation of China(grant nos.51820105003,21734008,61904181,and 52173188);the Key Research Program of the Chinese Academy of Sciences(grant no.XDPB13);the Basic and Applied Basic Research Major Program of Guangdong Province(grant no.2019B030302007);Y.W.acknowledges financial support from the Office of Naval Research(award no.N00014-19-1-2453);the use of the Stanford Synchrotron Radiation Light-source,SLAC National Accelerator Laboratory,which is supported by the U.S.Department of Energy,Office of Science,Office of Basic Energy Sciences(contract no.DE-AC02-76SF00515).

摘　　要：Side chain engineering with fluorine substitution is widely used to enhance photovoltaic performance of polymer donors in the research field of polymer solar cells(PSCs).However,fluorine substitution has disadvantages of complicated synthesis and high cost.Herein,we synthesized a novel D-A copolymer donor PBQ9 based on difluoroquinoxaline A-unit with chlorine substitution on its alkyl-thiophene side chains instead of fluorine substitution in the polymer donor PBQ6,which greatly shortens the synthetic route and reduces the cost.Interestingly,the optimized binary PSC with PBQ9 as polymer donor and m-TEH as acceptor demonstrated a high power conversion efficiency(PCE)of 18.81%(certified PCE of 18.33%by National Institute of Metrology,China)with a high fill factor of 80.59%,and the photovoltaic performance of the PSCs is insensitive to the different batches of the polymer donor.The results indicate that PBQ9 is a high-performance polymer donor and that chlorine substitution is an effective strategy to improve photovoltaic performance and reduce the cost of polymer donors.

关 键 词：D-A copolymer donors polymer solar cells difluoroquinoxaline A-unit chlorothiophene substituents 

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]