期刊
JOULE
卷 5, 期 5, 页码 1231-1245出版社
CELL PRESS
DOI: 10.1016/j.joule.2021.03.020
关键词
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资金
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council (Research Impact Fund) [R6021-18, C6023-19G, 16309218, 16310019, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China (NSFC) [91433202]
A highly crystalline small molecular acceptor named FCC-Cl with an optical band gap of 1.71 eV is reported for indoor applications, achieving high external quantum efficiency and fill factor in OPVs. The devices based on D18:FCC-Cl demonstrated an impressive power conversion efficiency of 28.8% under 2,600 K LED lighting, and can achieve high efficiencies over a wide range of active-layer thicknesses, suitable for large-scale roll-to-roll printing processes.
The growth of the internet of things (IoT) is creating a demand for convenient energy sources, like organic photovoltaics, to power various small loT devices. Here, we report a highly crystalline small molecular acceptor (named FCC-Cl) with an optical band gap of 1.71 eV suitable for indoor applications, The important design rationale of FCC-Cl is the combination of a weak electron-donating core and a moderate electron-withdrawing end group, which leads to needed band gap and high crystallinity. The OPVs based on D18:FCC-Cl achieved a high external quantum efficiency up to 85% and a high fill factor of 80% due to the high absorption coefficient and strong crystallinity of FCC-Cl. Consequently, an impressive power conversion efficiency of 28.8% was achieved under a 2,600 K LED lamp at 500 lux, It was also demonstrated that PM6:FCC-Cl-based devices can achieve high efficiencies over a wide range of active-layer thicknesses, which is a feature necessary for large-scale roll-to-roll printing processes.
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