A unified description of non-radiative voltage losses in organic solar cells

Xian-Kai Chen, Deping Qian (), Yuming Wang, Thomas Kirchartz, Wolfgang Tress, Huifeng Yao, Jun Yuan, Markus Hülsbeck, Maojie Zhang, Yingping Zou, Yanming Sun, Yongfang Li, Jianhui Hou, Olle Inganäs, Veaceslav Coropceanu (), Jean-Luc Bredas () and Feng Gao ()
Additional contact information
Xian-Kai Chen: The University of Arizona
Deping Qian: Linköping University
Yuming Wang: Linköping University
Thomas Kirchartz: IEK5-Photovoltaik, Forschungszentrum Jülich
Wolfgang Tress: Zurich University of Applied Sciences
Huifeng Yao: Chinese Academy of Sciences
Jun Yuan: Linköping University
Markus Hülsbeck: IEK5-Photovoltaik, Forschungszentrum Jülich
Maojie Zhang: Soochow University
Yingping Zou: Central South University
Yanming Sun: Beihang University
Yongfang Li: Chinese Academy of Sciences
Jianhui Hou: Chinese Academy of Sciences
Olle Inganäs: Linköping University
Veaceslav Coropceanu: The University of Arizona
Jean-Luc Bredas: The University of Arizona
Feng Gao: Linköping University

Nature Energy, 2021, vol. 6, issue 8, 799-806

Abstract: Abstract Recent advances in organic solar cells based on non-fullerene acceptors (NFAs) come with reduced non-radiative voltage losses (ΔVnr). Here we show that, in contrast to the energy-gap-law dependence observed in conventional donor:fullerene blends, the ΔVnr values in state-of-the-art donor:NFA organic solar cells show no correlation with the energies of charge-transfer electronic states at donor:acceptor interfaces. By combining temperature-dependent electroluminescence experiments and dynamic vibronic simulations, we provide a unified description of ΔVnr for both fullerene- and NFA-based devices. We highlight the critical role that the thermal population of local exciton states plays in low-ΔVnr systems. An important finding is that the photoluminescence yield of the pristine materials defines the lower limit of ΔVnr. We also demonstrate that the reduction in ΔVnr (for example,

Date: 2021
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DOI: 10.1038/s41560-021-00843-4

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