Refractive index dispersion and determination of the optical constants of BaTiO3 thin film prepared by sol gel
The optical properties of the BaTiO3 film deposited on ITO coated glass by sol–gel method using barium acetate and titanium isopropoxide as starting materials have been investigated. The optical constants such as refractive index absorption coefficient and dielectric constant were determined using optical spectra. Type of the optical transition was found to be a direct transition with an Eg value of 3.47 eV. The refractive index dispersion of the film obeys to single oscillator model with dispersion energy of 21.07 eV, oscillator energy of 5.20 eV and dispersion parameter Eo/So of 7.3x10-14 eV.m2. The obtained results indicate that the BaTiO3 film can be a probable candidate for optoelectronic applications as a wide gap material.