Structural and Optical Properties of TiO2Thin Films

TiO 2 thin films have been deposited onto well‐cleaned glass substrates by indigenously developed novel dip‐drive coating method at different pH values 1 and 11.2 of the sol. After deposition, the films were annealed at three temperatures ( 350 ° C , 450 ° C and 550 ° C ). X‐ray diffraction results have shown that TiO 2 films are ploy‐crystalline and have well defined anatase structure. The crystallites are preferentially oriented with (112) planes parallel to the substrate surface. The films have a high transparency (more than 75%) in the spectral range from 400 nm to 2500 nm. The analysis of absorption spectra shows the direct nature of band to band transitions. The optical band gap energy ranges between 3.15 eV and 3.25 eV.