ABSTRACT
Spray deposition and characterization of Cadmium Oxide (CdO) thin films deposited onto a glass plates at 2300C from an aqueous solution in three different molarities is discussed in this chapter. The prepared films were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and optical absorption techniques. Systematic XRD analysis of the film clearly indicates the polycrystalline hexagonal phase of the film with (111) orientation. The average grain size of the film is calculated using Scherrer’s relation and it is found to be 20 nm. SEM study shows that the total substrate surface is well covered with densely packed nanoclusters. The spectral absorption coefficient of the film at the fundamental absorption region (300–900nm) was determined using the spectral data of absorbance. The non-linear optical properties were analyzed. The energy band gap (Eg) was determined from Tauc’s plot, and it is found to be 2.17–1.99 eV. The carrier concentration of 14.9 x 1019 cm‒3 and resistivity of 1.23 x10‒3 Ωcm are obtained for 0.1M of CdO thin film.
