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Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages

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Cui, Yong, Yao, Huifeng, Zhang, Jianqi, Zhang, Tao, Wang, Yuming, Hong, Ling, Xian, Kaihu, Xu, Bowei, Zhang, Shaoqing, Peng, Jing, Wei, Zhixiang, Gao, Feng, Hou, Jianhui·2019·Nature Communications
DOI 10.1038/s41467-019-10351-5
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Abstract

Broadening the optical absorption of organic photovoltaic (OPV) materials by enhancing the intramolecular push-pull effect is a general and effective method to improve the power conversion efficiencies of OPV cells. However, in terms of the electron acceptors, the most common molecular design strategy of halogenation usually results in down-shifted molecular energy levels, thereby leading to decreased open-circuit voltages in the devices. Herein, we report a chlorinated non-fullerene acceptor, which exhibits an extended optical absorption and meanwhile displays a higher voltage than its fluorinated counterpart in the devices. This unexpected phenomenon can be ascribed to the reduced non-radiative energy loss (0.206 eV). Due to the simultaneously improved short-circuit current density and open-circuit voltage, a high efficiency of 16.5% is achieved. This study demonstrates that finely tuning the OPV materials to reduce the bandgap-voltage offset has great potential for boosting the efficiency.

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Metadata

Authors
Cui, Y., Yao, H., Zhang, J., Zhang, T., Wang, Y., Hong, L., Xian, K., Xu, B., Zhang, S., Peng, J., Wei, Z., Gao, F., & Hou, J.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2019-06-07
Volume
10
Issue
1
Pages
2515-2515
ISSN
2041-1723 (ISSN-L)
DOI
10.1038/s41467-019-10351-5
OpenAlex
W2948673221
Cited by
1,712
References
1
FWCI
113.32
Type
journal article
Language
en
Open access
gold
Licence
Funders
  • National Science Foundation of China | National Natural Science Foundation of China-Yunnan Joint Fund (21835006, 91633301, 51673201, 21805287, 51961135103, and 51961135103)
  • Energimyndigheten (2016-010174)

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CoChat. (2026). Citation check: Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages. https://app.cochat.ai/papers/10.1038/s41467-019-10351-5
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Cui, Y., Yao, H., Zhang, J., Zhang, T., Wang, Y., Hong, L., Xian, K., Xu, B., Zhang, S., Peng, J., Wei, Z., Gao, F., & Hou, J. (2019). Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages. Nature Communications. https://doi.org/10.1038/s41467-019-10351-5

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