Effect of Deposition Time On Optical Properties of Chemical Bath Deposited Mercury Sulfide Thin Layers

Mercury sulfide films were deposited on amorphous glass substrates from aqueous solutions by chemical bath deposition method (CBD) at same temperature and different deposition times. Produced layers were post annealed at 250°C about one hour. X-ray diffraction (XRD) was used to study of film’s crystalline structural. Their optical properties were measured by spectrophotometry in the spectra range of 400-850 nm, Kramers-Kronig method was used for the analysis of reflectivity curves of HgS films to obtain the optical constants of films in order to investigation of relation between deposition time and optical properties. According to X-ray diffraction details, all thin films showed crystalline phase with a preferential growth along the (220) planes. Optical results have been shown photolminisance property for HgS produced thin films. By increasing deposition time, the dielectric property, refractive index and band gap values are increased.