Importance of structural hinderance in performance–stability equilibrium of organic photovoltaics

Baobing Fan, Wei Gao, Xuanhao Wu, Xinxin Xia, Yue Wu, Francis R. Lin, Qunping Fan, Xinhui Lu, Wen Jung Li, Wei Ma and Alex K.-Y. Jen ()
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Baobing Fan: City University of Hong Kong
Wei Gao: City University of Hong Kong
Xuanhao Wu: Xi’an Jiaotong University
Xinxin Xia: The Chinese University of Hong Kong, New Territories
Yue Wu: City University of Hong Kong
Francis R. Lin: City University of Hong Kong
Qunping Fan: Xi’an Jiaotong University
Xinhui Lu: The Chinese University of Hong Kong, New Territories
Wen Jung Li: City University of Hong Kong
Wei Ma: Xi’an Jiaotong University
Alex K.-Y. Jen: City University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Power conversion efficiency and long-term stability are two critical metrics for evaluating the commercial potential of organic photovoltaics. Although the field has witnessed a rapid progress of efficiency towards 19%, the intrinsic trade-off between efficiency and stability is still a challenging issue for bulk-heterojunction cells due to the very delicate crystallization dynamics of organic species. Herein, we developed a class of non-fullerene acceptors with varied side groups as an alternative to aliphatic chains. Among them, the acceptors with conjugated side groups show larger side-group torsion and more twisted backbone, however, they can deliver an efficiency as high as 18.3% in xylene-processed cells, which is among the highest values reported for non-halogenated solvent processed cells. Meanwhile, decent thermal/photo stability is realized for these acceptors containing conjugated side groups. Through the investigation of the geometry–performance–stability relationship, we highlight the importance of side-group steric hinderance of acceptors in achieving combined high-performance, stable, and eco-friendly organic photovoltaics.

Date: 2022
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DOI: 10.1038/s41467-022-33754-3

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