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Fe2O3 thin films prepared by spray pyrolysis technique and study the annealing on its urbach energy and dispersion parameters

Khalid Haneen Abass

In this paper, we study the Ubach energy and dispersion parameters of Fe2O3 thin films that doped by 1% NiO prepared by Chemical pyrolysis method. The prepared films are annealed at 450 °C and 500 °C and then it recorded the optical absorption spectra by UV-Visible spectrophotometer in the range of (300-900) nm. The absorbance and Urbach energy increase with increasing annealing temperature for NiO:Fe2O3 thin films, while å1 and å2 decrease with increasing annealing temperature. The Wemple and Didomenico dispersion relationship that used to determine dispersion parameters. Energy gap calculated from Em = 2Eg, which found it decreases with annealing temperature from 2.68 eV before annealed to 2.57 eV after 500 °C. Dispersion parameters such as Ed, Em, å, n(0), M-1, and M-3 are decreased with annealing temperatures.