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Highly Efficient Organic Solar Cells Based on S,N-Heteroacene Non-Fullerene Acceptors

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journal contribution
posted on 06.07.2018 by Chuyi Huang, Xunfan Liao, Ke Gao, Lijian Zuo, Francis Lin, Xueliang Shi, Chang-Zhi Li, Hongbin Liu, Xiaosong Li, Feng Liu, Yiwang Chen, Hongzheng Chen, Alex K.-Y. Jen
Two novel non-fullerene acceptors, SN6IC and SN6IC-4F, based on an S,N-heteroacene backbone were designed and synthesized. The cyclopentadiene fragments of commonly used acceptors were replaced with pyrrole rings to improve the electron-donating ability to increase the energy levels of the molecules. Both acceptors match well with the absorption and energy levels of the polymer donor PBDB-T, and PBDB-T:SN6IC-4F-based solar cells showed an excellent power conversion efficiency of 13.2%, with a relatively small VOC loss of 0.54 eV. This study proves that the introduction of a nitrogen atom to replace the sp3-hybridized carbon in the fused ring is very effective for making highly efficient NFAs to further improve the performance of organic solar cells.

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