The effect of different Cu/Sn ratios on the properties of monoclinic Cu2SnS3 thin films and solar cells fabricated by the sol–gel method
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Ternary Cu2SnS3 (CTS) is a promising material for thin-film solar cells because it consists of nontoxic and earth-abundant elements. The present paper reports the preparation of monoclinic CTS thin films by a sol–gel solution-based method. The effects of the Cu/Sn atomic ratio on the structure and morphology were investigated. As the atomic ratio of Cu/Sn varied from 1.6 to 2.0, the compactness of the CTS films improved; furthermore, secondary phases, such as SnS, gradually disappeared; and the grain size of the films decreased. The CTS film with a Cu/Sn ratio of 1.9 showed a monoclinic structure with homogeneous morphology and a band gap of 1.12 eV, yielding a power conversion efficiency of 0.58%. These results could pave the way for the development of CTS thin-film solar cells.
This work was partially supported by the Fundamental Research Funds of Central South University (Grant Nos. 2018zzts431 and 2018zzts142) and the National Natural Science Foundation of China (51774341 and 51804352).
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