1) Cadmium oxide thin films doped with 2% indium were deposited on glass substrates using spray pyrolysis with cadmium acetate solutions of varying molar concentrations. 2) The films were found to be polycrystalline with a cubic structure and preferential orientation along the (111) crystallographic direction. Higher molar concentrations increased packing density and further oriented the crystallites along the (111) plane. 3) Optical transmission of the films increased with both wavelength and molar concentration. Band gap energies ranged from 2.3 to 2.45 eV depending on the molar concentration of the solution used, with higher concentrations resulting in higher band gap energies.

1. Abstract of Emerging Trends in Scientific Research, 2014, Vol.1
DOI: 10.18488/journal.1002/2014.1/1002.1
1st
International Conference on Emerging Trends in
Scientific Research
15-16 March, 2014
Pearl International Hotel Kuala Lumpur, Malaysia
Conference Website: www.pakrdw.com
68
Paper ID: 290/14/1
st
ICETSR
Effect of Molar Concentration on the Optical and Structural
Properties of Cdo: In Thin Films Deposited by Spray
Pyrolysis
Jinan Ali Abd1
--- Rafia T. Ahmed2
--- Nada A. Mohamed3
1,2,3
Collage of Science for Women, University of Babylon, Iraq
Abstract
Cadmium oxide (CdO:2%In) thin films have been deposited onto glass substrates from
different molar concentration of cadmium acetate precursor solution using a simple spray
pyrolysis technique. The structural and optical properties of the films have been
characterized by X-ray diffraction study and UV spectroscopy. The crystal structure of
the deposited films were found to be polycrystalline of cubic structure with preferentially
orientated along (111) crystallographic directions. Increase of molar concentration
increases the films packing density and reorient the crystallites along (1 1 1) plane. There
is an ancease in the optical transmissions for all films with increasing in the wavelength
and molar concentration . For different molar concentrations (0.1M ,0.2 M, and 0.3M),
the direct band gap is found to be in the range( 2.3 ,2.35,and 2.45 eV) . The band gap
energies depend on molar concentration of solution.