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Undoped and Indium doped tin disulphide (SnS2) thin films had been deposited onto glass substrates at Ts = 300 °C using spray pyrolysis technique under atmospheric pressure with stannous chloride, indium chloride and thiourea as precursors. The structural, optical and electrical properties of the deposited films were characterized. The XRD pattern revealed that the undoped and doped films had preferred orientation along (002) plane with hexagonal structure. FESEM micrographs had shown that morphologies of the films changed with indium doping. Optical constant such as refractive index (n), extinction coefficient (k), real and imaginary parts of dielectric constants were evaluated from transmittance and reflectance spectra in UV‐Visible spectroscopy. The optical absorption data were used to determine the band gap energy and it was found to be 2.75 eV for undoped and 2.50 eV for indium doped films respectively. The room temperature dark resistivity was found to be 4.545 × 103 Ω‐cm and 5.406 × 103 Ω‐cm for undoped and In‐doped films respectively.

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The present work investigates the effect of precursor concentration (m c) on the structural, optical, morphological and electrical conductivity properties of In 2 S 3 thin films grown on amorphous glass substrates by nebulized spray pyrolysis (NSP) technique. The mixed phase of cubic and tetragonal structure of In 2 S 3 thin films at higher concentration has been observed by X-ray diffraction pattern. The reduced strain by increasing the precursor concentration increased the average crystallite from 17.8 to 28.9 nm. The energy dispersive analysis by X-ray (EDAX) studies confirmed the presence of In and S. The transmittance, optical direct band gap energy, Urbach energy and skin depth of In 2 S 3 films have been analyzed by optical absorption spectra. The better conductivity and mobility noticed at m c = 0.15 M are explained by carrier concentration and crystallite. Better optical and electrical conductivity behaviour of In 2 S 3 thin film sample proposes for effective solar cell fabrication.

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