An Optimized Fibril Network Morphology Enables High-Efficiency and Ambient-Stable Polymer Solar Cells

Jiali Song, Linglong Ye, Chao Li, Jinqiu Xu, Sreelakshmi Chandrabose, Kangkang Weng, Yunhao Cai, Yuanpeng Xie, Padraic O'Reilly, Kai Chen, Jiajia Zhou, Yi Zhou, Justin M. Hodgkiss, Feng Liu, Yanming Sun*

*此作品的通讯作者

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41 引用 (Scopus)

摘要

Morphological stability is crucially important for the long-term stability of polymer solar cells (PSCs). Many high-efficiency PSCs suffer from metastable morphology, resulting in severe device degradation. Here, a series of copolymers is developed by manipulating the content of chlorinated benzodithiophene-4,8-dione (T1-Cl) via a random copolymerization approach. It is found that all the copolymers can self-assemble into a fibril nanostructure in films. By altering the T1-Cl content, the polymer crystallinity and fibril width can be effectively controlled. When blended with several nonfullerene acceptors, such as TTPTT-4F, O-INIC3, EH-INIC3, and Y6, the optimized fibril interpenetrating morphology can not only favor charge transport, but also inhibit the unfavorable molecular diffusion and aggregation in active layers, leading to excellent morphological stability. The work demonstrates the importance of optimization of fibril network morphology in realizing high-efficiency and ambient-stable PSCs, and also provides new insights into the effect of chemical structure on the fibril network morphology and photovoltaic performance of PSCs.

源语言英语
文章编号2001986
期刊Advanced Science
7
18
DOI
出版状态已出版 - 1 9月 2020
已对外发布

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Song, J., Ye, L., Li, C., Xu, J., Chandrabose, S., Weng, K., Cai, Y., Xie, Y., O'Reilly, P., Chen, K., Zhou, J., Zhou, Y., Hodgkiss, J. M., Liu, F., & Sun, Y. (2020). An Optimized Fibril Network Morphology Enables High-Efficiency and Ambient-Stable Polymer Solar Cells. Advanced Science, 7(18), 文章 2001986. https://doi.org/10.1002/advs.202001986