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Fabrication of CZTSSe absorbers by optimized selenization of one-step co-electrodeposited CZTS precursors

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Abstract

Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers are fabricated by co-electrodeposited Cu–Zn–Sn–S (CZTS) precursors followed by selenization. In order to complex the Cu ions and shift its reduction potential to more negative, trisodium citrate is applied as the complexing agent during the co-electrodeposition. After the co-electrodeposition, CZTS precursors are preliminary annealed at 280 °C in order to improve the homogeneity by intermixing of the elements. The influences of selenization temperatures on the chemical compositions, crystal phases, optical properties and photovoltaic device performances are also systematically investigated by X-ray energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, UV–vis absorption spectroscopy, and J–V measurements. EDS results reveal that the CZTSSe absorber layers are all in a Cu-poor and Zn-rich nature, which is beneficial for fabricating cells with high efficiency. It is found that the crystalline quality and morphology of the CZTSSe absorber can be greatly improved by post-selenization at 550 °C. Photovoltaic devices are fabricated with standard soda-lime glass (SLG)/Mo/CZTSSe/CdS/i-ZnO/ITO/Ag grid structures. Champion cell demonstrates 2.81% efficiency based on the optimized CZTSSe absorber. These results validate co-electrodeposition as a promising strategy for developing earth-abundant thin film solar cells at low-cost.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 61376061, 11274093, 51572070), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (B20140004), and the program for Changjiang Scholars and Innovative Research Team in University (No. PCS IRT_15R18).

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Authors and Affiliations

  1. Key Laboratory for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, Henan Province, People’s Republic of China

    Ke Cheng, Zhongcheng Kuang, Jingling Liu, Xinsheng Liu, Ranran Jin, Zhangbo Lu, Ya Liu, Longfei Guo & Zuliang Du

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  1. Ke Cheng
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  2. Zhongcheng Kuang
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Correspondence to Zuliang Du.

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Cheng, K., Kuang, Z., Liu, J. et al. Fabrication of CZTSSe absorbers by optimized selenization of one-step co-electrodeposited CZTS precursors. J Mater Sci 52, 11014–11024 (2017). https://doi.org/10.1007/s10853-017-1279-z

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