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 

机构地区：[1]College of Chemistry and Chemical Engineering,Central South University,Changsha 410000,Hunan,China [2]CAS Key Laboratory of Organic Solids,Institute of Chemistry Chinese Academy of Sciences,Beijing 100000,China [3]Department of Physics,The Chinese University of Hong Kong,Hong Kong 999077,China

出　　处：《Journal of Energy Chemistry》2022年第2期173-178,共6页能源化学（英文版）

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

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.

关 键 词：Fused-ring benzotriazole Side chains modification Low band-gap acceptors High-efficiency organic photovoltaics 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]