Contribution à l’étude de couches minces d’oxydes transparents conducteurs à base de zinc et de titan par spray pneumatique pour applications catalytiques et photovoltaïques

Abstract

Our study focused on the deposition and characterization of thin films based on zinc and titanium by pneumatic spray technique in order to obtain materials of good properties required for their use in the photovoltaic and photocatalytic applications. In the first part of our work, we have developed thin films of titanium oxide and zinc oxide to study the effect of molarity and precursor’s nature on the properties of these materials. The second part concerns the study of Ti doped ZnO and ZnO: TiO2 films. For this we analyzed our films by various techniques: DRX, SEM, EDS, UV-VIS-NIR and four probes technique. The main results of this work are the synthesized of Titanium oxide and zinc oxide thin films with good crystallite size, transmittance, band gap energy and conductivity requires adequate molarities such as 0.175M for TiCl3 and 0.05 M for Zinc chloride starting solutions sources. Films with 1:0.5 ZnO: TiO2 molar ratio could have good photocatalytic properties among the other samples, due to its high thickness 406 (nm) and low gap energy 3.03 eV and good structural properties including the growth of spinel Zinc Titanate Zn2TiO4 phase which is known as better photocatalysts than ZnO and TiO2 films separately.