Optimized active layer morphology toward efficient and polymer batch insensitive organic solar cells

Kangkang Weng, Linglong Ye, Lei Zhu, Jinqiu Xu, Jiajia Zhou, Xiang Feng, Guanghao Lu, Songting Tan, Feng Liu () and Yanming Sun ()
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Kangkang Weng: Beihang University
Linglong Ye: Beihang University
Lei Zhu: Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University
Jinqiu Xu: Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University
Jiajia Zhou: Beihang University
Xiang Feng: Frontier Institute of Science and Technology, Xi’an Jiaotong University
Guanghao Lu: Frontier Institute of Science and Technology, Xi’an Jiaotong University
Songting Tan: Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University
Feng Liu: Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University
Yanming Sun: Beihang University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Morphology control in laboratory and industry setting remains as a major challenge for organic solar cells (OSCs) due to the difference in film-drying kinetics between spin coating and the printing process. A two-step sequential deposition method is developed to control the active layer morphology. A conjugated polymer that self-assembles into a well-defined fibril structure is used as the first layer, and then a non-fullerene acceptor is introduced into the fibril mesh as the second layer to form an optimal morphology. A benefit of the combined fibril network morphology and non-fullerene acceptor properties was that a high efficiency of 16.5% (certified as 16.1%) was achieved. The preformed fibril network layer and the sequentially deposited non-fullerene acceptor form a robust morphology that is insensitive to the polymer batches, solving a notorious issue in OSCs. Such progress demonstrates that the utilization of polymer fibril networks in a sequential deposition process is a promising approach towards the fabrication of high-efficiency OSCs.

Date: 2020
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DOI: 10.1038/s41467-020-16621-x

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