Polymer-like tetramer acceptor enables stable and 19.75% efficiency binary organic solar cells

Jianxiao Wang, Cheng Sun, Yonghai Li (), Fuzhen Bi, Huanxiang Jiang, Chunming Yang, Xichang Bao () and Junhao Chu
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Jianxiao Wang: Chinese Academy of Sciences
Cheng Sun: Chinese Academy of Sciences
Yonghai Li: Chinese Academy of Sciences
Fuzhen Bi: Chinese Academy of Sciences
Huanxiang Jiang: Qingdao University
Chunming Yang: Chinese Academy of Sciences
Xichang Bao: Chinese Academy of Sciences
Junhao Chu: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Limited by large batch differences and inferior polymerization degree of current polymer acceptors, the potential high efficiency and stability advantages of all-polymer solar cells (all-PSCs) cannot be fully utilized. Alternatively, largely π-extended and structurally definite oligomer acceptors are effective strategies to realize the overall performance of polymer acceptors. Herein, we report a linear tetramer acceptor namely 4Y-BO with identical molecular skeleton and comparable molecular-weight relative to the control polymer acceptor PY-BO. The structurally definite tetramer shows refined film-forming kinetics and improved molecular ordering, offering uniform crystallinity with polymer donor and hence well-defined fibrous heterojunction textures. Encouragingly, the PM6:4Y-BO devices achieve an efficiency up to 19.75% (certified efficiency:19.58%), largely surpassing that of the control PM6:PY-BO device (15.66%) and ranks the highest among solar cells based on oligomer and polymer acceptors. More noticeably, thermal stability, photostability and mechanical flexibility are collectively enhanced for PM6:4Y-BO devices. Our study provides an important approach for fabricating high performance and stable organic photovoltaics.

Date: 2025
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DOI: 10.1038/s41467-025-57118-9

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