Abstract

The sol-gel derived spin-coated Copper (Cu) doped cadmium sulphide (CdS) thin films were deposited on glass substrates. The structural, optical, electrical, and non-linear properties of the films have been investigated in detail. The crystal structure of the Cu-doped CdS films was found to be the hexagonal phase, and an improvement in the crystallinity was observed. The optical absorbance was found to change with deposition parameters, and the bandgap of the films was found to be 2.3 eV, which varied with doping and annealing. The photoluminescent properties of the films showed green and near band edge emission. The electrical characteristics of the Cu-doped CdS films were investigated by Hall effect measurements. The copper doped CdS thin films exhibited prominent NLO properties. The NLA coefficients β obtained are of the order of 10−9m/W. The nonlinear refractive index n2 and nonlinear susceptibility χ (3) values were found to be of the order of 10−11 esu.

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