Admix of Cu2ZnSnS4 and ZnS as thin film to absorb visible light
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Admix of Cu2ZnSnS4 (CZTS) and ZnS phases in thin films were prepared on glass substrate by thermal evaporation from CuS, ZnS and SnS as precursors. Their composition, microstructure and optical properties of thin films were determine using energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–Vis absorption. The conglomerate grain shape of the obtained materialare elongated with dense morphology. Kesterite structure was obtained after heat treatment at 400 °C of precursors. By Rietveld refinement method was determined the presence of CZTS phase and ZnS phase at 65% and at 35%, respectively. By elemental analysis, it was notice Cu loss in the heating process. Band gap value of the resulting material was 1.49 eV. Regarding to the optoelectronic properties for make solar cells, this film shows good photoconductivity.
This research is financial supported by National Council of Science and Technology of Mexico and the Juarez Autonomous University of Tabasco, through the funds (CONACyT) SEP—CONACyT 239590 and PRODEP UJAT—PTC—253, respectively. The author thanks to M. C. Edith Ponce Recinos and M. C. Anabel González Díaz, by DRX and EDS-SEM measurements, respectively. In addition, the first author acknowledges to CONACyT for her graduate fellowship. Thanks to W. Antunez, E. Lestarjet and C. Ornelas for their help at Nanotech, CIMAV Chihuahua. Mexico.
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