Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

Lijiao Ma, Shaoqing Zhang (), Jincheng Zhu, Jingwen Wang, Junzhen Ren, Jianqi Zhang and Jianhui Hou ()
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Lijiao Ma: Institute of Chemistry Chinese Academy of Sciences
Shaoqing Zhang: University of Science and Technology Beijing
Jincheng Zhu: University of Science and Technology Beijing
Jingwen Wang: Institute of Chemistry Chinese Academy of Sciences
Junzhen Ren: Institute of Chemistry Chinese Academy of Sciences
Jianqi Zhang: CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Jianhui Hou: Institute of Chemistry Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Non-fullerene acceptors (NFAs) based on non-fused conjugated structures have more potential to realize low-cost organic photovoltaic (OPV) cells. However, their power conversion efficiencies (PCEs) are much lower than those of the fused-ring NFAs. Herein, a new bithiophene-based non-fused core (TT-Pi) featuring good planarity as well as large steric hindrance was designed, based on which a completely non-fused NFA, A4T-16, was developed. The single-crystal result of A4T-16 reveals that a three-dimensional interpenetrating network can be formed due to the compact π–π stacking between the adjacent end-capping groups. A high PCE of 15.2% is achieved based on PBDB-TF:A4T-16, which is the highest value for the cells based on the non-fused NFAs. Notably, the device retains ~84% of its initial PCE after 1300 h under the simulated AM 1.5 G illumination (100 mW cm−2). Overall, this work provides insight into molecule design of the non-fused NFAs from the aspect of molecular geometry control.

Date: 2021
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DOI: 10.1038/s41467-021-25394-w

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