Unraveling the influence of non-fullerene acceptor molecular packing on photovoltaic performance of organic solar cells

Linglong Ye, Kangkang Weng, Jinqiu Xu, Xiaoyan Du, Sreelakshmi Chandrabose, Kai Chen, Jiadong Zhou, Guangchao Han, Songting Tan, Zengqi Xie, Yuanping Yi, Ning Li (), Feng Liu (), Justin M. Hodgkiss, Christoph J. Brabec and Yanming Sun ()
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Linglong Ye: Beihang University
Kangkang Weng: Beihang University
Jinqiu Xu: Shanghai Jiao Tong University
Xiaoyan Du: Friedrich-Alexander-Universität Erlangen-Nürnberg
Sreelakshmi Chandrabose: Victoria University of Wellington
Kai Chen: Victoria University of Wellington
Jiadong Zhou: South China University of Technology
Guangchao Han: Chinese Academy of Sciences
Songting Tan: Xiangtan University
Zengqi Xie: South China University of Technology
Yuanping Yi: Chinese Academy of Sciences
Ning Li: Friedrich-Alexander-Universität Erlangen-Nürnberg
Feng Liu: Shanghai Jiao Tong University
Justin M. Hodgkiss: Victoria University of Wellington
Christoph J. Brabec: Friedrich-Alexander-Universität Erlangen-Nürnberg
Yanming Sun: Beihang University

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

Abstract: Abstract In non-fullerene organic solar cells, the long-range structure ordering induced by end-group π–π stacking of fused-ring non-fullerene acceptors is considered as the critical factor in realizing efficient charge transport and high power conversion efficiency. Here, we demonstrate that side-chain engineering of non-fullerene acceptors could drive the fused-ring backbone assembly from a π–π stacking mode to an intermixed packing mode, and to a non-stacking mode to refine its solid-state properties. Different from the above-mentioned understanding, we find that close atom contacts in a non-stacking mode can form efficient charge transport pathway through close side atom interactions. The intermixed solid-state packing motif in active layers could enable organic solar cells with superior efficiency and reduced non-radiative recombination loss compared with devices based on molecules with the classic end-group π–π stacking mode. Our observations open a new avenue in material design that endows better photovoltaic performance.

Date: 2020
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DOI: 10.1038/s41467-020-19853-z

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