Highly efficient organic solar cells with improved stability enabled by ternary copolymers with antioxidant side chains

作     者：Ao Song Qiri Huang Chunyang Zhang Haoran Tang Kai Zhang Chunchen Liu Fei Huang Yong Cao Ao Song;Qiri Huang;Chunyang Zhang;Haoran Tang;Kai Zhang;Chunchen Liu;Fei Huang;Yong Cao

作者机构：Institute of Polymer Optoelectronic Materials and DevicesState Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology(SCUT)Guangzhou 510640China 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2023年第44卷第8期

页      面：48-56页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：This work was financially supported by National Key Research and Development Program of China(No.2019YFA0705900)funded by MOST the Basic and Applied Basic Research Major Program of Guangdong Province(No.2019B030302007) the National Natural Science Foundation of China(No.U21A6002) Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials(No.2019B121205002) 

主　　题：organic solar cells ternary copolymers antioxidant side chain photostability 

摘      要：The stability of organic solar cells(OSCs)remains a major concern for their ultimate industrialization due to the photo,oxygen,and water susceptibility of organic photoactive ***,antioxidant additives are blended as radical scavengers into the active ***,it will induce the intrinsic morphology instability and adversely affect the efficiency and long-term ***,the antioxidant dibutylhydroxytoluene(BHT)group has been covalently linked onto the side chain of benzothiadiazole(BT)unit,and a series of ternary copolymers D18-Cl-BTBHTx(x=0,0.05,0.1,0.2)with varied ratio of BHT-containing side chains have been *** was found that the introduction of BHT side chains would have a negligible effect on the photophysical properties and electronic levels,and the D18-Cl-BTBHT0.05:Y6-based OSC achieved the highest power conversion efficiency(PCE)of 17.6%,which is higher than those based active layer blended with BHT *** importantly,the unencapsulated device based on D18-Cl-BTBHTx(x=0.05,0.1,0.2)retained approximately 50%of the initial PCE over 30 hours operation under ambient conditions,significantly outperforming the control device based on D18-Cl(90%degradation in PCE after 30 h).This work provides a new structural design strategy of copolymers for OSCs with simultaneously improved efficiency and stability.