"Effect of Ce doped on the structural, optical, electrical and sensing properties of V2O5 thin films prepared by chemical spray pyrolysis "

Abstract

"V2O5 films doped with different cerium concentrations are deposited onto glass, p-type Si (111) and porous silicon (PS) substrates with temperature of 250 C by chemical spray pyrolysis technique (CSPT). V2O5 powder was dissolved in distilled water to prepare 0.05 M precursor solution. Ce doped vanadium oxide films were prepared, adding cerium oxide (CeO2) with the ratios of 0%, 3%, 5%, 7% and 9% in separate solution. XRD analysis revealed a polycrystalline nature of the orthorhombic structure with the preferred orientation of (010) with nano crystallite size. Atomic Force Microscope (AFM) showed a good uniformity revealing a uniform growth of the films. The spectral absorption of the films occurred at the absorption edge of 550 nm. Un-doped V2O5 and doped with different concentration of Ce films have direct allowed transition band gap ranging from 2.2 eV to 2.55 eV according to dopant ratios of Ce. Electrical conductivity and Hall effect was studied to determine the type of prepared films. Sensitivity of NO2 and H2 gas at different doping ratios and different temperatures was calculated"