期刊
ACS ENERGY LETTERS
卷 5, 期 11, 页码 3415-3425出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01688
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资金
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council [R6021-18, 16305915, 16322416, 606012, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China (NSFC) [91433202]
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- National Natural Science Foundation of China [61974006]
- Guangdong Natural Science Foundation [2018A030313332]
- National Natural Research Foundation of China [21702158]
- ONR [N000141712204]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
The field of organic solar cells has experienced paradigm-shifting changes in recent years because of the emergence of nonfullerene acceptors (NFAs). It is critically important to gain more insight into the structure-property relationship of the emerging A'-DAD-A'-type NFAs. In this Letter, a family of NFAs named BPF-4F, BPT-4F, and BPS-4F incorporating various chalcogen-containing heterocycles, i.e., furan, thiophene, and selenophene, respectively, was designed and synthesized. These NFAs exhibited dramatic differences in their photovoltaic performances with device efficiencies of 16.8% achieved by the thiophene-based cells, which was much higher than the furan-based ones (12.6%). In addition, the selenophene-based NFA showed a red-shifted absorption relative to the furan- and thiophene-based ones and obtained a decent efficiency of 16.3% owing to an improved J(SC). The reasons why these NFAs performed differently are systematically studied by comparing their optoelectronic properties and film morphology, which provides new understandings of the molecular design of high-performance NFAs.
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