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.