Optical Properties of Nano-structured TiO2 Thin Films Deposited by Sol-Gel Dip Coating Method

Abstract

In this work, the sol–gel dip coating technique was used to prepare nano-structured titanium dioxide (TiO2) thin films onto glass substrate with
different annealing temperatures, and the effects of annealing temperatures on optical properties of thin films were investigated. Optical constants
such as optical band gap and thicknesses of thin films were determined from the measured transmittance spectra in wavelengths between 300 and
1100 nm. Calculations on the annealed thin films showed that, as the annealing temperatures varies, optical band gap ranges from 3.33 to 3.69 eV,
thickness ranges from 48 to 375 nm and transmittance ranges from 81% to 98% in the visible region.