Abstract
ZnS films were deposited by spray pyrolysis at 450 0C on glass substrates. In order to study the influence of manganese, nickel and copper on the properties of ZnS film, undoped and Mn/Ni/Cu – doped films were synthesized and investigated using x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy, ultra violet–visible absorption transmission spectroscopy and photoluminescence studies. The absorption coefficient was measured and correlated with the photon energy to estimate the energy gap, which varies with the different dopant. x-ray diffraction analysis revealed the polycrystalline zinc sulphide film with cubic structure and a preferential orientation along (111) plane. The size of the zinc crystallites was determined using the full width half maximum values of Bragg peak. The crystallite size and the refractive index of the films increased when the film thickness increased. The absorption edge shifting towards visible region on doping.
Keywords:

Key words: Zinc sulphide, Spray pyrolysis, Dopant, Optical properties, Refractive index