Indium sulfide (In _(2) S _(3) ) thin films have been synthesized on glass substrates using the spray technique (CSP). The S?:?In molar ratio was varied from 1 to 4 in the starting solution. The Raman analysis confirms the formation of the β-In _(2) S _(3) material and the absence of a secondary phase. The EDS analysis reveals that our layers are pure. The thin film surface is free of cracks, as observed in AFM images. Optical transmission achieved 80% in the visible and near infrared region. The refractive index ( n ) is affected by the changes in the S/In molar ratio. The optical parameters, single oscillator energy ( E _(0) ), dispersion energy ( E _(d) ) and high frequency dielectric constant ( ε _(∞) ), are calculated via the Wemple–DiDomenico model. In addition, the photoconductivity kinetics in In _(2) S _(3) films for S/In = 2 were investigated and analyzed. The I – V characteristics and the photoresponse were also studied.
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