Optical characterizations of quaternary Cu2MnSnS4 thin films: Novel synthesis process of film samples by spray pyrolysis technique

Abstract

This article has reported the synthesis of the Cu2MnSnS4 thin films of different thicknesses using a cost-effective spray pyrolysis technique. The X-ray diffraction results of the Cu2MnSnS4 thin films have demonstrated that the Cu2MnSnS4 films are polycrystalline in nature and exhibited a tetragonal structure. The linear optical results of the Cu2MnSnS4 thin films revealed that the films illustrate optical direct transitions and optical energy gaps in the range (1.49 eV–1.21 eV). The effect of thickness on the skin depth δ, absorption coefficient α, linear refractive index n and the static refractive index no of the Cu2MnSnS4 thin films was studied. Moreover, the results have displayed that there is an improvement in the magnitudes of the refractive index, optical conductivity, third-order nonlinear optical susceptibility and the nonlinear refractive index of the Cu2MnSnS4 thin films occurred with increasing the thickness.