期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 10, 页码 11543-11550出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20544
关键词
non-fullerene acceptor; organic solar cell; polymer; trifluoromethyl group; power conversion efficiency
资金
- China (Shenzhen)-Canada Technology Collaboration Project [GJHZ20180420180725249]
- Shenzhen Science and Technology research grant [JCYJ20170818090312652, JCYJ20170412151139619]
- China (Shenzhen)-United States Technology Collaboration Project [GJHZ20180928163206500]
- National Natural Science Foundation of China [51903005]
- Shenzhen Peacock Plan [KQTD2014062714543296]
- Guangdong Key Research Project [2019B010924003]
- Shenzhen Engineering Laboratory (Shenzhen Development and Reform Commission) [[2016]1592]
- NSERC of Canada
- Peng Cheng Scholar award
- China Scholarship Council (CSC) [201806010248]
Herein, we report a new molecule structure modification strategy for non-fullerene small-molecule electron acceptors (NFAs) for solar cells through trifluoro-methylation of end-capping groups. The synthesized trifluoromethylated acceptor ITCF3 exhibits narrower band gap, stronger light absorption, lower molecular energy levels, and better electron transport property compared to the reference NFA without the trifluoromethyl group (ITIC). Bulk heterojunction solar cells based on ITCF3 combined with the PM6 polymer donor exhibit a significantly improved power conversion efficiency of 13.3% compared with the ITIC-based device (8.4%). This work reveals great potential of trifluoromethylation in the design of efficient photovoltaic acceptor materials.
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