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Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-group Engineering and Noncova-lently Conformational Locks
  • +5
  • Bo Liu,
  • Congqi Li,
  • Xiaobin Gu,
  • Yinghui Han,
  • Zhixiang Wei,
  • Yunhao Cai,
  • Xin Zhang,
  • Yanping Huo
Bo Liu
Guangdong University of Technology
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Congqi Li
University of the Chinese Academy of Sciences
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Xiaobin Gu
University of the Chinese Academy of Sciences
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Yinghui Han
University of the Chinese Academy of Sciences
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Zhixiang Wei
National Center for Nanoscience and Technology
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Yunhao Cai
University of the Chinese Academy of Sciences
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Xin Zhang
University of the Chinese Academy of Sciences

Corresponding Author:zhangxin2019@ucas.ac.cn

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Yanping Huo
Guangdong University of Technology
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Abstract

By employing the asymmetric end-group engineering, an asymmetric nonfused-ring electron acceptors (NFREAs) was designed and synthesized. Compared with the symmetric analogs (NoCA-17 and NoCA-18), NoCA-19 possesses broader light absorption range, more coplanar π-conjugated backbone, and appropriate crystallinity according to the experimental and theoretical results. The organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%, which is much higher than those of J52:NoCA-17 (9.50%) and J52:NoCA-18 (11.77%), mainly due to more efficient exciton dissociation, better and balanced charge mobility, suppressed recombination loss, shorter charge extraction time, longer charge carrier lifetimes, and more favorable blend film morphology. These findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs.
04 Oct 20231st Revision Received
07 Oct 2023Submission Checks Completed
07 Oct 2023Assigned to Editor
07 Oct 2023Review(s) Completed, Editorial Evaluation Pending
10 Oct 2023Editorial Decision: Accept