Optimizing side chains on different nitrogen aromatic rings achieving 17% efficiency for organic photovoltaics

作     者：Zhe Li Can Zhu Jun Yuan Liuyang Zhou Wei Liu Xinxin Xia c Juan Hong Honggang Chen Qingya Wei Xinhui Lu Yongfang Li Yingping Zou Zhe Li;Can Zhu;Jun Yuan;Liuyang Zhou;Wei Liu;Xinxin Xia;Juan Hong;Honggang Chen;Qingya Wei;Xinhui Lu;Yongfang Li;Yingping Zou

作者机构：College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410000HunanChina CAS Key Laboratory of Organic SolidsInstitute of Chemistry Chinese Academy of SciencesBeijing 100000China Department of PhysicsThe Chinese University of Hong KongHong Kong 999077China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第2期

页      面：173-178页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 080501[工学-材料物理与化学] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：support of the National Natural Science Foundation of China (21875286) the National Key Research and Development Program of China (2017YFA0206600) 

主　　题：Fused-ring benzotriazole Side chains modification Low band-gap acceptors High-efficiency organic photovoltaics 

摘      要：Balancing charge generation and low energy loss(E_(loss)), especially in the wide spectral absorption region is critical to obtain high-performance organic photovoltaics(OPVs). Therefore, Y11-M and Y11-EB are designed and synthesized through modifying alkyl chains on different nitrogen aromatic rings of the reported non-fullerene acceptor Y11. Although all the molecules have almost similar low band-gap(around 1.30 e V), Y11-M and Y11-EB exhibit wider absorption in 410–870 nm region. Eventually, the conventional devices based on Y11-M and Y11-EB possess more efficient charge generation with low Eloss(around 0.44 e V). In addition, outstanding efficiencies of 16.64% and 17.15% with the fill factor of 76.15% and 74.73% are obtained in PM6:Y11-M and PM6:Y11-EB-based devices, both higher than Y11:PM6. The results highlight the importance of rational alkyl chains optimization, and a good structureproperty relationship is established as well.