Résumé:
In this Work, undoped and Pb-doped ZnO thin films have been prepared by sol gel method and deposited on glass substrate using dipcoating technique. The structural, morphological, and optical properties
of the films were investigated as a function of Pb doping. The results of the structural tests showed that these films are of a polycrystalline hexagonal structure with a preferred orientation in the (002) direction. The grain size values of Pb-doped films were lower than that of pure ZnO, but the stain and dislocation density values inecrease with increase Pb doping ratio.Scannig electron microscopy (SEM) images showed that all zinc oxide films become homogeneous. The AFM images showed that the particle size (RMS) of ZnO decrease with increasing Pb doping.The optical band gap values were found to increase from (3.19 to 3.30eV) and Urdach energy decrease from (322 to 313 meV). PL spectra exhibit an increased amount of defects with increasing Pb, which leads to a red shift in the UV region.The results of Raman spectroscopy indicated the formation of zinc oxide ZnO nanoparticles with polycrystalline structure in the form of hexagonal wurtzite.
