Investigations on the optical constants of indium oxide thin films prepared by ultrasonic spray pyrolysis

In2O3 thin films were deposited on glass substrates at different temperatures (380–500 °C). The optical films properties were determined from transmission and reflection spectra in the 260–2600 nm spectral range. The transmission coefficient in the visible and infrared regions, exceed 85% and is weakly affected by deposition temperature. The band gap for direct transitions is 3.57–3.68 eV. The dispersion of the real refractive index (n) and extinction coefficient (k) have been obtained from transmission and reflection spectra by means of the Forouhi and Bloomer model.