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

Chen, Xian-Kai; Qian, Deping; Wang, Yuming; Kirchartz, Thomas; Tress, Wolfgang; Yao, Huifeng; Yuan, Jun; Hülsbeck, Markus; Zhang, Maojie; Zou, Yingping; Sun, Yanming; Li, Yongfang; Hou, Jianhui; Inganäs, Olle; Coropceanu, Veaceslav; Bredas, Jean-Luc; Gao, Feng

doi:10.1038/s41560-021-00843-4

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	A unified description of non-radiative voltage losses in organic solar cells
Authors:	Chen, Xian-Kai Qian, Deping Wang, Yuming Kirchartz, Thomas Tress, Wolfgang Yao, Huifeng Yuan, Jun Hülsbeck, Markus Zhang, Maojie Zou, Yingping Sun, Yanming Li, Yongfang Hou, Jianhui Inganäs, Olle Coropceanu, Veaceslav Bredas, Jean-Luc Gao, Feng
et. al:	No
DOI:	10.1038/s41560-021-00843-4
Published in:	Nature Energy
Volume(Issue):	6
Issue:	8
Page(s):	799
Pages to:	806
Issue Date:	2021
Publisher / Ed. Institution:	Nature Publishing Group
ISSN:	2058-7546
Language:	English
Subject (DDC):	621.3: Electrical, communications, control engineering
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, <0.2 V) can be obtained without sacrificing charge generation efficiency. Our work suggests designing donor and acceptor materials with high luminescence efficiency and complementary optical absorption bands extending into the near-infrared region.
URI:	https://digitalcollection.zhaw.ch/handle/11475/22961
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Chen, X.-K., Qian, D., Wang, Y., Kirchartz, T., Tress, W., Yao, H., Yuan, J., Hülsbeck, M., Zhang, M., Zou, Y., Sun, Y., Li, Y., Hou, J., Inganäs, O., Coropceanu, V., Bredas, J.-L., & Gao, F. (2021). A unified description of non-radiative voltage losses in organic solar cells. Nature Energy, 6(8), 799–806. https://doi.org/10.1038/s41560-021-00843-4

Chen, X.-K. et al. (2021) ‘A unified description of non-radiative voltage losses in organic solar cells’, Nature Energy, 6(8), pp. 799–806. Available at: https://doi.org/10.1038/s41560-021-00843-4.

X.-K. Chen et al., “A unified description of non-radiative voltage losses in organic solar cells,” Nature Energy, vol. 6, no. 8, pp. 799–806, 2021, doi: 10.1038/s41560-021-00843-4.

CHEN, Xian-Kai, 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 und Feng GAO, 2021. A unified description of non-radiative voltage losses in organic solar cells. Nature Energy. 2021. Bd. 6, Nr. 8, S. 799–806. DOI 10.1038/s41560-021-00843-4

Chen, Xian-Kai, Deping Qian, Yuming Wang, Thomas Kirchartz, Wolfgang Tress, Huifeng Yao, Jun Yuan, et al. 2021. “A Unified Description of Non-Radiative Voltage Losses in Organic Solar Cells.” Nature Energy 6 (8): 799–806. https://doi.org/10.1038/s41560-021-00843-4.

Chen, Xian-Kai, et al. “A Unified Description of Non-Radiative Voltage Losses in Organic Solar Cells.” Nature Energy, vol. 6, no. 8, 2021, pp. 799–806, https://doi.org/10.1038/s41560-021-00843-4.