Enhanced photovoltaic performance of A-D-A'-D-A type non-fused ring electron acceptors via side chain engineering

被引:5
|
作者
Zhou, Xia [1 ,2 ]
Wei, Wenkui [2 ]
Pang, Shuting [2 ]
Yuan, Xiyue [2 ]
Li, Junyu [3 ]
Huang, Fei [2 ]
Cao, Yong [2 ]
Duan, Chunhui [2 ]
机构
[1] Ningbo Univ Technol, Sch New Energy, Ningbo 315336, Peoples R China
[2] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China
[3] Eindhoven Univ Technol, Mol Mat & Nanosyst & Inst Complex Mol Syst, NL-5600 MB Eindhoven, Netherlands
基金
中国国家自然科学基金;
关键词
organic solar cells; non-fused ring electron acceptors; side chain engineering; molecular orientation; power conversion efficiency; POLYMER; CELLS; CORE;
D O I
10.1007/s40843-023-2867-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Featuring simplified synthesis and flexible chemical alteration, non-fused ring electron acceptors (NFREAs) are the ideal candidates for constructing low-cost organic solar cells (OSCs). Herein, we report three A-D-A'-D-A type NFREAs, namely ffBTz-BO, ffBTz-EH, and ffBTz-C4, where difluorinated benzotriazole (ffBTz) with different side chain lengths were employed as the weak electron-deficient A' core. Compared with ffBTz-BO and ffBTz-C4, ffBTz-EH with appropriate side chain length strikes a balance between the enhanced molecular crystallinity and the favorable face-on orientation, resulting in high charge mobilities. Consequently, ffBTz-EH-based OSC delivered the highest power conversion efficiency (PCE) of 12.96% enabled by its efficient charge transport and most suitable phase separation, which represents one of the highest efficiencies among A-D-A'-D-A type NFREAs. This work demonstrates that alkyl side chain on the central A' core plays a critical role in tuning molecular crystallinity, active layer morphology, and further device performance, which provides a meaningful perspective for designing highly efficient A-D-A'-D-A type non-fused ring electron acceptors in the future.
引用
收藏
页码:1594 / 1601
页数:8
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