Enhanced of Tio2 Properties by Sn Doping

Abstract

Due to their interesting properties: chemical, optical and electrical, titanium dioxide (TiO₂) attracts the attention of several researchers, and many studies have been carried out to control its properties [1, 2]. And because of its wide fields of application such as optoelectronics, photocatalysis, biology…. thin layers of TiO₂ have attracted much attention from industrialists and researchers [3, 6]. In order to improve its properties, we are interested in this work in the development and study of the variation of the properties of TiO₂ by Sn doping at different concentrations. Given its simplicity, speed and cost, the deposition of our layers (on ordinary glass substrates) we have chosen the Sol-Gel method linked to the spin-coating technique. In our study we based on the study of the structural, optical and electrical properties of Sn-doped SnO₂ layers. The XRD spectra show good crystallization of all the layers with the presence of a single anatase phase. Concerning the UV-Visible, the spectra show a high transmittance of the films in the visible with a transmission rate varying between 75% and 95% with a wide optical gap between 3.4eV and 3.7eV. Concerning the optical properties of our films, its resistivity is low (about 10^-2 Ω.Cm), we still note the minimum value of 4.29 x10-2 Ω.Cm for the 3% doping.