Investigation and comparison of optical properties of CdO and CdGaO transparent conductive metal oxide thin films

Abstract

Optical analyses of the electrochemically deposited CdO and CdGaO transparent metal oxide thin films were performed at 300 and 800 nm wavelength range using UV-vis spectrometer to aimed to provide an option for optoelectronic application fields. It is found that transmittance, absorption coefficient, extinction coefficient, refractive index, imaginary dielectric constant, real dielectric constant, dielectric loss and optical conductivity values of CdO were 82%, 3.3 x 106 m-1, 0.16, 1.26, 0.4, 1.59, 0.27 and 9.5 x 1014, respectively, while these of CdGaO were 45%, 1.18 x 106 m-1, 0.04, 1.17, 0.1, 1.17, 0.08 and 3.3 x 1014, respectively. Additionally, the direct energy ban gap of CdO and CdGaO thin films were determined as 2.85 eV and 2.68 eV.