期刊
ADVANCED MATERIALS
卷 33, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202102420
关键词
energy loss; light utilization; molecular design; organic photovoltaic cells; power conversion efficiency
类别
资金
- National Key Research and Development Program of China - MOST [2019YFA0705901]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- National Natural Science Foundation of China (NSFC) [52003275, 51961135103, 21805287, 22075301, 21734008]
- Youth Innovation Promotion Association CAS [2018043]
- China Postdoctoral Science Foundation [2019M660800, 2019M660799]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-201903, 2019BMS20005]
By combining material design and ternary blending strategy, a maximum power conversion efficiency of 19.0% is achieved in single-junction OPV cells. Optimized active layer structure significantly improves the photovoltaic parameters, enhancing the performance and PCE values of the cells.
Improving power conversion efficiency (PCE) is important for broadening the applications of organic photovoltaic (OPV) cells. Here, a maximum PCE of 19.0% (certified value of 18.7%) is achieved in single-junction OPV cells by combining material design with a ternary blending strategy. An active layer comprising a new wide-bandgap polymer donor named PBQx-TF and a new low-bandgap non-fullerene acceptor (NFA) named eC9-2Cl is rationally designed. With optimized light utilization, the resulting binary cell exhibits a good PCE of 17.7%. An NFA F-BTA3 is then added to the active layer as a third component to simultaneously improve the photovoltaic parameters. The improved light unitization, cascaded energy level alignment, and enhanced intermolecular packing result in open-circuit voltage of 0.879 V, short-circuit current density of 26.7 mA cm(-2), and fill factor of 0.809. This study demonstrates that further improvement of PCEs of high-performance OPV cells requires fine tuning of the electronic structures and morphologies of the active layers.
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