Journal
NATIONAL SCIENCE REVIEW
Volume 7, Issue 7, Pages 1239-1246Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwz200
Keywords
organic photovoltaic cells; power conversion efficiency; scalable large-area production; processability; non-fullerene acceptor
Categories
Funding
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- National Natural Science Foundation of China (NSFC) [21805287]
- Youth Innovation Promotion Association, CAS [2018043]
- NSFC [21835006, 51961135103, 51673201]
- China Postdoctoral Science Foundation [2019M660800]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-201903]
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The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors (NFAs), has enabled rapid progress in organic photovoltaic (OPV) cells in recent years. Although the power conversion efficiencies (PCEs) of the top-performance OPV cells have surpassed 16%, the devices are usually fabricated via a spin-coating method and are not suitable for large-area production. Here, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.
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