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NiO films with different thickness were deposited on to glass substrates using the spray pyrolysis technique, The thickness of the prepared films were 140,180,240,280 and 330 nm Transmission and absorption spectra were recorded in the wavelength range 300-900 nm in order to study the effect of increasing thickness on some optical constants such as reflectance, absorption coefficient , refractive index, extinction coefficient, real and imaginary parts of dielectric constant and optical conductivity. This study reveals that all these parameters affect by increasing the thickness.

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Abstarct

Co2O3 and Co2O3(1-x):Cux films have been deposited by using spray pyrolysis technique on a glass substrates. The optical properties of the cobalt oxide have been studied as a function of doping concentration with Cu. Changes in direct optical band gap energy of cobalt oxide films were confirmed after doping, Eg increased from 1.48 and 1.95 eV for the undoped Co2O3 to 1.55 and 2.05 eV with increasing the doping concentration to 5%. The effect of doping on the optical parameters of Co2O3 thin films such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant has been reported.

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