EFFECT OF TIME OF DEPOSITION ON OPTICAL AND SURFACE MORPHOLOGY OF CZTS THIN FILMS DEPOSITED BY CHEMICAL BATH DEPOSITION METHOD FOR PHOTOVOLTAIC APPLICATIONS
2023
Ayinla, Rasaq | Rasaki Kola, Odunaike
Thin film solar cells required good absorber layers to convert solar radiation to electricity. Cadmium telluride (CdTe) and copper indium gallium diesselinide (CIGS) are most popular absorber layer for thin film solar cell but toxicity of cadmium and scarcity of tellurium, indium and gallium limit the usage and availability of the films. Copper zinc tin silphide (CZTS) thin films have nontoxic and abundant elements. CZTS thin films were deposited onto soda lime glass (SLG) using chemical bath deposition method at room temperature. The precursor solution was made from copper nitrate, zinc nitrate, tin chloride and thiourea as sources of Cu, Zn, Sn and sulphur, respectively. The time of depositions were varied between 15 and 90 minutes in 15 minutes interval. The films were characterized by UV Visible spectrophotometer, Scanning electron microscopy and energy dispersive spectroscopy (EDS) for optical, surface morphology and elemental compositional studies. The optical parameters showed that low reflectance, transmittance and high absorbance with band gap energy of 1.50 -1.62 eV.
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