Effects of Cadmium Content on Optical Parameters of Cd_xZn_(1-x)O Thin Films Prepared by Sol-Gel Method

摘要

Cd_x Zn_(1-x)O thin films with different Cd contents ranging from O to 0.75 were prepared by the sol-gel spin-coating method. The optical parameters, such as optical band gap, absorption coefficient, Urbach energy, refractive index, dispersion parameter, and optical conductivity, were studied in order to investigate the effects of Cd content on the optical properties of the Cd_X Zn_(1-X)O thin films. The optical band gap and Urbach energy decreased as Cd content increased. The dispersion energy, single-oscillator energy, average oscillator wavelength, average oscillator strength, and refractive index at infinite wavelength of the Cd-X Zn_(1-X)O thin films were affected by Cd incorporation. The optical conductivity of the Cd_X Zn_(1-X)O thin films also increased with increasing photon energy.