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OPTICAL DISPERSION CHARACTERIZATION OF SPRAYED Co2O3:Cu THIN FILMS

SaadOboudi

Uniform and adherent cobalt oxideCo2O3 andcopper doped cobalt oxide Co2O3:Cu films have been deposited by using spray pyrolysis technique (SPT) on glass substrates. For investigating the structure and optical properties of thin films, X-ray diffraction (XRD) and UV-vis spectra were used. Increasing dopant caused an increase in the crystal size. The optical properties and dispersion parameters of cobalt oxide have been studied as a function of Cu dopant concentration. Changes in direct optical band gap of cobalt oxide films were confirmed after doping,the optical energy gap 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 of Cu to 5%. The changes in dispersion parameters and Urbach tails were investigated. An increase in the doping concentration causes a decrease in the average oscillator strength from 45.60 to 25.32. The single-oscillator parameter has been reported.