A Simple Nonfused Ring Electron Acceptor with a Power Conversion Efficiency Over 16%

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.

Automated summary

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.