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Thin films of amorphous BaTiO 3  (a-BTO) were grown by spin coating technique on a glass substrate and annealed at different temperatures, from 300 to 500 °C, with a step of 50 °C. The samples were characterized structurally by X-ray diffraction (XRD), where broadband around 25 °  indicates the amorphous formation in all the thin films. The optical properties of the a-BTO thin films were determined by transmittance and reflectance UV-Visible spectroscopy. The optical responses were fit using Lorentz and Lorentz-Tauc classical models to determine the complex dielectric function. In addition, the photoluminescence (PL) of the glass and the a-BTO/glass system was also measured to observe the antireflective capacity of the a-BTO thin film as a function of the calcination temperature. To understand the experimental structural results ab-initio molecular dynamic calculation of 2x2x2 BTO supercell was utilized, while the electronic density of state and the complex dielectric function were obtained using Density Functional Theory (DFT). A comparison between the experimental and theoretical results is presented and discussed.

Optical study of a-BaTiO 3 thin films grown at different annealing temperatures