Abstract
The Cu2ZnSnS4 (CZTS) thin films were successfully prepared on glass substrate by pulsed laser deposition (PLD) using CZTS target. The laser incident energy was varied from 3 J·cm -2 to 6 J·cm -2 at the interval of 1 J·cm -2 , and its influence on chemical composition, crystal structure, morphology and band gap of CZTS thin films was investigated by energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), atomic force microscopy (AFM) and ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectra, respectively. The result of EDS indicated that these CZTS thin films were Cu-rich and S-poor. The XRD study showed CZTS thin films exhibited strong preferential orientation of grains along (112) direction. The band gap of CZTS thin films was 1.72, 1.37, 1.25 and 1.11 eV corresponding to incident laser energy of 3, 4, 5 and 6 J·cm -2 .
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