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Optical study of titanium dioxide thin films prepared by vacuum evaporation technique

Author(s): Saad Farhan Oboudi, Nadir Fadhil Habubi, Ali Hussein Ni'ma, Sami Salmann Chiad

In this investigation, TiO2 thin films were synthesized by vacuum evaporation technique on glass substrates at room temperature. The films were then annealed at 200 and 250ºC in air for a period of 1 hour. The optical characterizations of the as deposited and annealed films were carried out using UV–VIS transmittance spectroscopy in the wavelength range 300– 900 nm in order to calculate the optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant. Results illustrate that refractive index, extinction coefficient, both the real and imaginary parts of dielectric constant and the optical conductivity of the films are increasing with increasing annealing temperature, on the other hand, the value of the skin depth is found to be decreases as the annealing temperature increased to 250ºC, so the skin depth is a transmittance related.

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