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

Huang, Chuyi; Liao, Xunfan; Gao, Ke; Zuo, Lijian; Lin, Francis; Shi, Xueliang; Li, Chang-Zhi; Liu, Hongbin; Li, Xiaosong; Liu, Feng; Chen, Yiwang; Chen, Hongzheng; Jen, Alex K.-Y.

doi:10.1021/acs.chemmater.8b02276.s001

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

https://doi.org/10.1021/acs.chemmater.8b02276.s001
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journal contribution

posted on 2018-07-06, 00:00 authored 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.