In this research, Nickel oxide (NiO) thin film were prepared by using nickel chloride ( NiCl2.6H2O) on glass substrate by using Spray Pyrolysis technique. The Structural and optical properties were studied for the growth thin films under influence different molarities (0.5,1,2 M) by XRD , SEM . The optical properties studied in the wavelength range from 200-1100nm measured by UV-VIS Spectrometer device.
The X-ray diffraction studies indicated that intensity was increased with molarities increase and had cubic structure , these films has grain size values (4.13-11.95 nm) with different molarities (0.5, 1 , 2M) , SEM found the films has smooth surface with grains scattered throughout the surface and the surface the films filled with the clusters of the larger grains the at increase molarities and AFM it is found the (RMS) of NiO films increased from 7.77 to 20.7 nm and the roughness average increased from 5.73-15.6 nm with the increase of molarities from 0.5-2 M .
From the optical studies it is found the film thickness increased with molarities increase, while the transmittance decreased from approximately 75% to approximately 54% and the energy gap for the NiO films varies from ( 3.65 to 3.1eV) as the molarities increase.