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wxAMPS theoretical study of the bandgap structure of CZTS thin film to improve the device performance

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Abstract

The carrier recombination was one of the factors limiting the further improvement of the Cu2ZnSnS4 (CZTS) thin film solar cells. In this paper, a proper bandgap structure was designed to solve this problem. The effects of the different bandgap structure on the CZTS thin film solar cells were studied by the solar cell performance simulation software wxAMPS. A graded bandgap structure was designed and optimized. The bandgap with a front bandgap gradient and a flat bandgap gradient had a favorable effect on the CZTS thin film solar cells. Finally, the fill factor (FF) and conversion efficiency (η) of the CZTS thin film solar cell were increased from 36.41% to 42.73% and from 6.85% to 10.03%, respectively. In addition, the effect of donor and acceptor defect densities in CZTS absorber layer near the CdS/CZTS interface on the device performance was studied, η of the CZTS thin film solar cell was increased from 5.99% to 7.55% when the acceptor defect concentration was 1012–1013 cm−3. Moreover, the thicknesses of the CZTS absorber layer were optimized. The FF and η of the CZTS thin film solar cell were increased to 63.41% and 15.04%, respectively.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China

    Yanping Wang  (王延平), Jiao Wang  (王姣), Haoran Li  (李浩然), Aimei Zhao  (赵爱美), Bing Li  (李冰), Jinlian Bi  (毕金莲) & Wei Li  (李微)

Authors
  1. Yanping Wang  (王延平)
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  2. Jiao Wang  (王姣)
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  3. Haoran Li  (李浩然)
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  4. Aimei Zhao  (赵爱美)
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  5. Bing Li  (李冰)
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  6. Jinlian Bi  (毕金莲)
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  7. Wei Li  (李微)
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Corresponding authors

Correspondence to Jinlian Bi  (毕金莲) or Wei Li  (李微).

Additional information

This work has been supported by the National Natural Science Foundation of China (No.61804108).

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Wang, Y., Wang, J., Li, H. et al. wxAMPS theoretical study of the bandgap structure of CZTS thin film to improve the device performance. Optoelectron. Lett. 17, 475–481 (2021). https://doi.org/10.1007/s11801-021-0159-6

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  • DOI: https://doi.org/10.1007/s11801-021-0159-6

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