Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 41, Issue 6, Pages 665-671Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.202200673
Keywords
Organic solar cells; Nonfused ring electron acceptors; Nonfullerene acceptors; Low-cost acceptors; High-performance acceptors
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By simplifying the pi-bridge unit, a nonfused ring electron acceptor (NFREA) BM-2F was designed and synthesized. The specific molecular structure features of BM-2F with planar molecular backbone and out-of-plane side chain are favorable for charge transport and can suppress the over-aggregation. BM-2F based neat and blend films display obvious face-on molecular orientation. Specially, a power conversion efficiency of 16.15% was achieved with D18:BM-2F based photovoltaic devices, which is the highest one based on NFREAs. Our researches manifest that NFREA is a promising direction for low-cost and high-performance organic solar cells.
Comprehensive SummaryBy simplifying the pi-bridge unit, a nonfused ring electron acceptor (NFREA) BM-2F was designed and synthesized with several high-yield steps. The specific molecular structure features of BM-2F are planar molecular backbone and out-of-plane side chain, which is favorable for charge transport and can suppress the over-aggregation. BM-2F based neat and blend films display obvious face-on molecular orientation. Specially, D18:BM-2F based blend film can form good bicontinuous interpenetrating network. More excitingly, a power conversion efficiency of 16.15% was achieved with D18:BM-2F based photovoltaic devices, which is the highest one based on NFREAs. Our researches manifest that NFREA is a promising direction for low-cost and high-performance organic solar cells.
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