Characterization of optical properties of thin film Ba1-xSrxTiO3 (x = 0,70; x= 0,75; and x=0,80) using ultraviolet visible spectroscopy

Barium Strontium Titanate (BST) is a ferroelectric material largely developed in field of material. BST is a combination of two materials Perovskite Barium Titanate (BT) and Strontium Titanate (ST). BST thin film grown on glass substrate has successfully done using sol-gel method. The study aimed to determine the optical properties including absorbance, transmittance, deviation index, coating thickness, coating absorption coefficient, and energy tape energy band gap using tauc plot method with different compositions. Characterization of BST thin film was done using Ultraviolet-Visible (UV-Vis) Spectrophotometer. Maximum absorption obtained in the study occurred in sample Ba0.2Sr0.8TiO3 at 700°C with wavelength 300 nm. Result of UV-Vis characterization of thin film Ba1-xSrxTiO3 for x = 0.70; x = 0.75 and x=0.80 at 700°C for thin film showed the width of energy band gap respectively 2.96 eV; 3.40 eV and 2.70 eV. The width of energy band gap obtained at the same temperature and different composition in the study was semiconductor material.