Geometry design of tethered small-molecule acceptor enables highly stable and efficient polymer solar cells

Yang Bai, Ze Zhang, Qiuju Zhou, Hua Geng, Qi Chen, Seoyoung Kim, Rui Zhang, Cen Zhang, Bowen Chang, Shangyu Li, Hongyuan Fu, Lingwei Xue, Haiqiao Wang, Wenbin Li, Weihua Chen, Mengyuan Gao, Long Ye, Yuanyuan Zhou, Yanni Ouyang, Chunfeng Zhang, Feng Gao, Changduk Yang, Yongfang Li and Zhi-Guo Zhang ()
Additional contact information
Yang Bai: Beijing University of Chemical Technology
Ze Zhang: Beijing University of Chemical Technology
Qiuju Zhou: Xinyang Normal University
Hua Geng: Capital Normal University
Qi Chen: Beijing University of Chemical Technology
Seoyoung Kim: Ulsan National Institute of Science and Technology (UNIST)
Rui Zhang: Linköping University
Cen Zhang: Beijing University of Chemical Technology
Bowen Chang: Beijing University of Chemical Technology
Shangyu Li: Beijing University of Chemical Technology
Hongyuan Fu: Beijing University of Chemical Technology
Lingwei Xue: Beijing University of Chemical Technology
Haiqiao Wang: Beijing University of Chemical Technology
Wenbin Li: Zhengzhou University
Weihua Chen: Zhengzhou University
Mengyuan Gao: Tianjin University
Long Ye: Tianjin University
Yuanyuan Zhou: Hong Kong Baptist University, Hong Kong, China, Smart Society Lab, Hong Kong Baptist University
Yanni Ouyang: Hong Kong Baptist University, Hong Kong, China, Smart Society Lab, Hong Kong Baptist University
Chunfeng Zhang: Nanjing University
Feng Gao: Linköping University
Changduk Yang: Ulsan National Institute of Science and Technology (UNIST)
Yongfang Li: Institute of Chemistry, Chinese Academy of Sciences
Zhi-Guo Zhang: Beijing University of Chemical Technology

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract With the power conversion efficiency of binary polymer solar cells dramatically improved, the thermal stability of the small-molecule acceptors raised the main concerns on the device operating stability. Here, to address this issue, thiophene-dicarboxylate spacer tethered small-molecule acceptors are designed, and their molecular geometries are further regulated via the thiophene-core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution and TDY-β with 3, 4-substitution on the core. It shows that TDY-α processes a higher glass transition temperature, better crystallinity relative to its individual small-molecule acceptor segment and isomeric counterpart of TDY-β, and a more stable morphology with the polymer donor. As a result, the TDY-α based device delivers a higher device efficiency of 18.1%, and most important, achieves an extrapolated lifetime of about 35000 hours that retaining 80% of their initial efficiency. Our result suggests that with proper geometry design, the tethered small-molecule acceptors can achieve both high device efficiency and operating stability.

Date: 2023
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DOI: 10.1038/s41467-023-38673-5

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