Abstract
CZTS thin films have been prepared from the electrolyte with different pH values by co-electrodeposition. The effects of bath pH value on the cyclic voltammetry, structure, morphology, composition and optical properties of CZTS thin films have been investigated in details. Cyclic voltammetry measurements reveal that pH value impacts the reduction potential of metals and the composition in precursors. The analyses of XRD and Raman spectroscopy suggest that the CZTS films have better crystallinity and less secondary phases when the bath pH is about 5.0. The chemical composition and morphological studies indicate the formation of compact and homogenous CZTS thin films with stoichiometric composition at a pH value of 5.0. And its bandgap energy is around 1.49 eV.
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