Effect of annealing temperature on the optical and electrical properties of Mg doped TiO₂ thin films
Abstract
In order to achieve high conductivity and transmittance of transparent conducting
oxide (TCO), we attempted to fabricate Mg doped TiO₂ (Mg0.01Ti0.99O2) thin films and
characterized them for their structural and optical properties. The materials were prepared
by modified sol-gel route. Mg0.01Ti0.99O2 thin films were deposited on glass substrate by
doctor's blade technique. The structure of the films were confirmed to be tetragonal and
particle size were estimated to be ≈11.1 nm from XRD analysis. The optical property study
in the same range shows higher value of absorbance in comparison to the pure TiO₂ film after the wavelength 425 nm. The band gap is estimated to be much lower than pure TiO₂ (3.2 eV). So the study shows that doping a small amount of Mg can enhance the visible
light absorption in the epitaxial thin film which can be a suitable material for use in solar cell to trap the solar-radiation.