Etude des propriétés physiques des couches minces de ZnO dopées Al,préparées par la méthode de « sol-gel » associée au « spin coating »
Studies of physical properties of the Al doped ZnO thin films prepared by sol-gel method associated with spin coating.
In this work, thin films of ZnO intrinsic and doped Al are prepared by sol-gel technique associated with spin-coating onto glass substrates. Zinc acetate dehydrate, ethanol and mono-ethanolamine were used as a starting material, solvent and stabilizer, respectively. The structural, electrical and optical properties of the prepared films were analyzed by X-ray diffraction, transmittance, absorbance spectra and Photoluminescence spectroscopy respectively. All films are polycrystalline with a hexagonal wurtzite-type structure with a preferential orientation according to the direction <002>. The 4-points technique used to characterise electrically. All films exhibit a transmittance above 80-90 % along the visible range up to 650 nm and a sharp absorption on set about 375 nm corresponding to the fundamental absorption edge 3.3 eV. Intense UV photoluminescence is observed for intrinsic ZnO film.