期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 45, 页码 16092-16095出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b09998
关键词
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资金
- National Basic Research Program of China (973 Program) [2013CB834701, 2014CB643501]
- Hong Kong Research Grants Council [T23-407/13 N, N_HKUST623/13, 16305915, 16322416, 606012, 16303917]
- HK JEBN Limited
- HKUST president's office [FP201]
- National Science Foundation of China [21374090]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/083/15]
- U.S. DOE [DE-AC02-05CH11231]
We report a novel small molecule acceptor (SMA) named FTTB-PDI4 obtained via ring-fusion between the thiophene and perylene diimide (PDI) units of a PDI-tetramer with a tetrathienylbezene (TTB) core. A small voltage loss of 0.53 V and a high power conversion efficiency of 10.58% were achieved, which is the highest value reported for PDI-based devices to date. By comparing the fused and nonfused SMAs, we show that the ring-fusion introduces several beneficial effects on the properties and performances of the acceptor material, including more favorable energy levels, enhanced light absorption and stronger intermolecular packing. Interestingly, morphology data reveal that the fused molecule yields higher domain purity and thus can better maintain its molecular packing and electron mobility in the blend. Theoretical calculations also demonstrate that FTTB-PDI4 exhibits a double-decker geometry with two pairs of mostly parallel PDI units, which is distinctively different from reported PDI-tetramers with highly twisted geometries and can explain the better performance of the material. This work highlights the promising design of PDI-based acceptors by the ring-fusion strategy.
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