期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 36, 页码 15246-15251出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c07083
关键词
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资金
- APRC Grant of the City University of Hong Kong [9380086, 9610421]
- Innovation and Technology Fund [ITS/497/18FP, GHP/021/18SZ]
- Office of Naval Research [N00014-20-1-2191]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
- Guangdong-Hong Kong-Macao joint laboratory of optoelectronic and magnetic functional materials [2019B121205002]
Understanding the molecular structure and self-assembly of thiadiazole-derived non-fullerene acceptors (NFAs) is very critical for elucidating the origin of their extraordinary charge generation and transport properties that enable high power conversion efficiencies to be achieved in these systems. A comprehensive crystallographic study on a state-of-the-art NFA, Y6, and its selenium analog, CH1007, has been conducted which revealed that the face-to-face pi-core interaction induced by benzo[2,1,3]thiadiazole S-N-containing moieties plays a significant role in governing the molecular geometries and unique packing of Y6 and CH1007 to ensure their superior charge-transport properties. Moreover, benefitting from the red-shifted optical absorption via selenium substitution, photovoltaic devices based on a PM6:CH1007:PC71BM ternary blend delivered an exceptionally high short-circuit current of 27.48 mA/cm(2) and a power conversion efficiency of 17.08%.
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