The trade-off between efficiency and stability is a bit vague,and it can be tricky to precisely control the bulk morphology to simultaneously improve device efficiency and stability.Herein,three fused-ring conducted polymer acceptors containing furan,thiophene and selenophene as the electron linkers in their conjugated backbones,namely PY-O,PY-S and PY-Se,were designed and synthesized.The electron linker engineering affects the intermolecular interactions of relative polymer acceptors and their charge transport properties.Furthermore,excellent material compatibility was achieved when PY-Se was blended with polymer donor PBDB-T,resulting in nanoscale domains with favorable phase separation.The optimized PBDB-T:PY-Se blend not only exhibits maximum performance with a power conversion efficiency of 15.48％,which is much higher than those of PBDB-T:PY-O(9.80％)and PBDB-T:PY-S(14.16％)devices,but also shows better storage and operational stabilities,and mechanical robustness.This work demonstrates that precise modification of electron linkers can be a practical way to simultaneously actualize molecular crystallinity and phase miscibility for improving the performance of all-polymer solar cells,showing practical significance.

Qiang Wu;Wei Wang;Yao Wu;Rui Sun;Jing Guo;Mumin Shi;Jie Min

The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China;Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou 450002,China;Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China

国家科学评论（英文版）

[1]Qiang Wu;Wei Wang;Yao Wu;Rui Sun;Jing Guo;Mumin Shi;Jie Min-.Tailoring polymer acceptors by electron linkers for achieving efficient and stable all-polymer solar cells)[J].国家科学评论（英文版）,2022(02):83-93

selenophene,actualize

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