Abstract
The crystallographic microstructural and optical properties of CZTS thin film have been investigated with influence of copper concentration in spray solution. The X-ray and Raman study carried out to the prepared CZTS thin films and attained pure kesterite phase. The results of microstructural properties such as crystallite size, d-spacing, microstrain, texture coefficient and standard deviation investigated. The prepared CZTS thin film shows very high optical absorption of the order of 105 cm−1 in the visible region and the optical band gap energy varied between 1.45 and 1.47 eV. This optical band gap tuning is most applicable for solar cells. By using the Wemple–DiDomenico (WDD) single oscillator model, the optical parameters were calculated such as single oscillator energy (E0), dispersion energy (Ed), static refractive index (n0), etc. Large values of optical conductivity (σ) give the promise to the solar cell application.
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