Halogen-free Polymer Donors Based on 3,4-Dicyanothiophene for High-performance Polymer Solar Cells  

作　　者：Yun-Li Zhao Yue Zhang Xi-Yue Yuan Wan-Yuan Deng Bo Zhang Shu-Ting Pang Bing-Yan Yin Hong-Bin Wu Kai-Wen Lin Zhi-Tian Liu Chun-Hui Duan Fei Huang Yong Cao 

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,510640,China [2]Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials,Wuhan Institute of Technology,Wuhan,430205,China [3]Department of Materials and Food,University of Electronic Science and Technology of China Zhongshan Institute,Zhongshan,528402,China

出　　处：《Chinese Journal of Polymer Science》2022年第8期905-913,I0008,共10页高分子科学（英文版）

基　　金：The work was financially supported by the Ministry of Science and Technology of China(Nos.2017YFA0206600 and 2019YFA0705900);the National Natural Science Foundation of China(Nos.21875072,U20A6002 and 51973169);Guangdong Innovative and Entrepreneurial Research Team Program(No.2019ZT08L075);This study also received financial support from Science and Technology Foundation of Guangdong Province(No.2021A0101180005);Special Projects in Key Areas for the University of Guangdong Province(No.2021ZDZX1009).

摘　　要：Polymer solar cells(PSCs)consisting of a polymer donor and a small molecular acceptor is a promising photovoltaic technology,whose device performance is determined by both polymer donor and small molecular acceptor.Halogen atoms such as fluorine or chlorine atoms were usually introduced onto the polymer donors to downshift the highest occupied molecular orbital(HOMO)energy levels and improve the open-circuit voltage(VOC)of the PSCs.However,the introduction of the halogen atoms especially fluorine atoms greatly complicates the polymer synthesis.Herein,we report the use of a structural simple and easily synthesized building block,3,4-dicyanothiophene(DCT),to construct a set of halogen-free polymer donors PBCNTx(x=25,50,75)via ternary random copolymerization.The introduction of DCT units not only simplified the synthesis,but also downshifted the HOMO energy levels of the polymers and improved the V_(OC) of PSCs effectively.Encouragingly,the PBCNT75 afforded a power conversion efficiency up to 15.7%with a V_(OC) of 0.83 V,which are among the top values for halogen-free polymer donors.This work shows that the introduction of DCT units is a simple yet effective strategy to construct halogen-free and low-cost polymer donors for high-performance PSCs.

关 键 词：Polymer solar cells Polymer donors HALOGEN-FREE Open-circuit voltage Energy loss 

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