Structural and Optical Properties of (CdO)_1-x(SnO₂)_x Thin Films Prepared by Pulsed Laser Deposition

Abstract

CdO thin films have been deposited at different concentration of SnO2 (x= (0.0, 0.05, 0.1, 0.15 and 0.2)) Wt. % onto glass substrates by pulsed laser deposition technique (PLD) using Nd-YAG laser with λ=1064nm, energy=600mJ and number of shots=500. X-ray diffraction (XRD) results reveal that the deposited (CdO)1-x(SnO2)x thin films cubic structure and the grain size increase with increasing annealing temperature and increasing concentration of SnO2. The optical transition in the (CdO)1-x(SnO2)x thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of annealing temperatures and increase with increasing concentration of SnO2 for all samples.

Synthesis and Characterization of CdO Nanoparticles Prepared by Pulse Laser Deposition

“…The direct (E g op ) decrease from (2.5-2.3) eV. This decrease in the values of optical energy gap may be due to the increased density of state that lead to the formation of secondary levels within the energy gap.This decrease may be due to the expansion of lattice , which causes shift at the edge position of the VB and CB bands through the growth of grain size, as less causes of defects near the bands [17] . Figure .9 Shows the absorption coefficient of all CdO membranes prepared at laser energies (400,500,600,700) mJ .…”