Effect of doping on optical properties of In2S3 produced nano layers; chemical deposition, Kramers-Kronig method

Indium sulfide Nano layers were deposited on SiO₂ amorphous substrates by chemical bath deposition technique at 70°C temperature aqueous solution temperature and pH=2.2 constant value. Cu⁺³ ions by different concentration dopped from CuCl₂ source into In₂S₃ layers. Produced layers post annealed at 400°C about one hour. Optical reflectance measured in the wavelength of 350-950 nm by spectrophotometer. Other optical properties and optical band gaps were calculated using Kramers-Kronig relations on reflectivity curves.