期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 7, 页码 3475-3482出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta09049d
关键词
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资金
- National Natural Science Foundation of China (NSFC) [21428304, 21225209, 91427303, 51473009, 21504006, 21534003]
- NSFC-DFG joint project TRR61 [21261130581]
- Chinese Academy of Sciences [XDB12010100]
- International Science & Technology Cooperation Program of China [2014DFA52820]
- 111 project [B14009]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
A series of propeller-shaped triperylene hexaimide (TPH) non-fullerene acceptors, featuring branched alkyl side chains with different lengths (TPH-4, TPH-5, TPH-6, and TPH-7), have been designed and synthesized. The effects of the branched alkyl chain length on the physical properties, thin-film microstructure, molecular packing, charge transport and the resulting photovoltaic properties of these materials have been systematically investigated. It was found that TPH-7 with the longest alkyl side chain showed the best photovoltaic performance compared with three other TPH molecules, and an outstanding power conversion efficiency (PCE) of 8.6% under AM 1.5G irradiation (100 mW cm(-2)) has been obtained using a wide-band-gap polymer PDBT-T1 as the electron donor. These results demonstrate that finely tailoring alkyl substituents on TPH-based small molecular acceptors critically impacts the structural order of thin films and molecular orientation, and thus the photovoltaic performance.
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