Effect of Terminal Electron-Withdrawing Group on the Photovoltaic Performance of Asymmetric Fused-Ring Electron Acceptors

被引:15
作者
Li, Chao [1 ]
Lu, Guangkai [1 ]
Ryu, Hwa Sook [2 ]
Sun, Xiaobo [1 ]
Woo, Han Young [2 ]
Sun, Yanming [1 ]
机构
[1] Beihang Univ, Sch Chem, Beijing 100191, Peoples R China
[2] Korea Univ, Coll Sci, Dept Chem, Seoul 136713, South Korea
基金
中国国家自然科学基金; 新加坡国家研究基金会;
关键词
terminal group; fused-ring electron acceptor; asymmetric small molecule; electron-withdrawing group; organic solar cells; SOLAR-CELLS; STRATEGY; CORE;
D O I
10.1021/acsami.2c10557
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The terminal electron-withdrawing group is thought to strongly influence pi-pi stacking interactions and thereby the charge transport properties of fused-ring electron acceptors (FREAs). In this work, we designed and synthesized three asymmetric/symmetric small molecule FREAs (LC301, LC302, and LC303), in which three electron-withdrawing functional groups with different polarities (phenyl-fused indanone < thienyl-fused indanone < F-modified phenyl-fused indanone) were selected as the terminal groups. Photophysical properties, electro-chemistry, charge transport, and crystalline properties of the materials were studied to investigate the effect of electron-withdrawing abilities of the terminal groups on the properties of FREAs. Starting from the symmetric LC302 (two thienyl-fused indanone terminal groups), we have found that by simply replacing only one thienyl-fused indanone terminal group in symmetric LC302 with one difluorinated phenyl-fused indanone terminal group, the asymmetric LC301-based organic solar cells (OSCs) can yield a high power conversion efficiency (PCE) of 17.21% and a promising fill factor (FF) of 78.1%, which are higher than those of symmetric LC302-based OSCs (PCE = 15.18%, FF = 73.3%) and the asymmetric LC303-based OSCs bearing one thienyl-fused indanone terminal group and one nonfluorinated phenyl-fused indanone terminal group (PCE = 14.28%, FF = 70.3%). The results indicate that the rational selection of terminal groups with different electron-withdrawing capabilities is highly desirable for designing high-performance asymmetric FREAs.
引用
收藏
页码:43207 / 43214
页数:8
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