Abstract
Solvent engineering is an important route for improving the quality of solution-processed copper-zinc-tin-sulfur-selenium (CZTSSe) thin films. Here, blended solvents composed of dimethyl sulfoxide (DMSO) and dimethyl formamide (DMF) were used to prepare CZTSSe precursor solution. The addition of DMF improved the wettability of precursor solution on Mo-coated substrates and modified the CZTSSe formation. Impacts of different DMF contents in solvents on morphological, structural, optical and photovoltaic properties of CZTSSe films were fully studied. Compared with the pure DMSO-based precursor solution, incorporation of an appropriate amount of DMF into DMSO can effectively increase the grain size and improve the film compactness, while adding excess DFM decreased the crystallinity and deteriorated the device performance. By optimizing DMF content, the carrier lifetime of CZTSSe thin film was increased from 2.78 ns to 5.07 ns and the energy conversion efficiencies of solar cells were improved from 4.77% to 6.03%.
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Acknowledgements
This work was supported by the Natural Science Foundation of Jiangxi Province (Grant No. 20192ACB20006), the National Natural Science Foundation of China (Grant No. 62064005), the Double Thousand Plan of Jiangxi Province (Grant No. jxsq2018101019), and the Innovative Talents Program of Ganzhou.
Funding
Natural Science Foundation of Jiangxi Province (Grant No. 20192ACB20006), National Natural Science Foundation of China (Grant No. 62064005), Double Thousand Plan of Jiangxi Province (Grant No. jxsq2018101019), Innovative Talents Program of Ganzhou.
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Zhao, J., Tan, X., Zhao, W. et al. Improved CZTSSe thin-film morphology and device performance by using DMSO/DMF blended solvent. Appl. Phys. A 127, 603 (2021). https://doi.org/10.1007/s00339-021-04753-w
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DOI: https://doi.org/10.1007/s00339-021-04753-w