Optical Properties of Nanostructured NiO Thin Films Prepared by Spray Pyrolysis Method

In this work, nickel oxide thin films was fabricated on glass substrate at different temperature by spray pyrolysis technique. The NiO layers were obtained with different molar concentrations. The NiO thin films were crystallized with a cubic structure that can be related to obtaining peaks in the XRD diffraction of NiO thin films. The optical transmission of the deposited films was measured in the range of (300–900nm) by using an ultraviolet-visible spectrophotometer (LAMBDA 25).The transmission spectra shows that the NiO thin films have a good optical transparency in the visible region. The optical gap energy varied between 3.28 and 3.82 eV. The NiO thin films prepared with a molar concentration C=0.2mol/l at a temperature of T=460°C has the best transmittance of 90% and has a band gap energy value of 3.41eV. The Ni1-xZnxO thin films prepared with a molar concentration C=0.05mol/l at a temperature of T=480°C and x=0.13 has a transmittance of 82% and has a band gap energy of 3.72 eV. The pure NiO thin films prepared with a molar concentration C=0.1mol/l at a temperature of T=360°C has the largest refractive index value of 1.98.