Studying the Effect of Deposition Time on Optical Properties of CdS Thin Films

Abstract

Studying the Effect of Deposition Time on Optical Properties of CdS Thin Films R. A. Al-WardyDepartment of clinical laboratory science/college of pharmacy/Al-mustansiriyah university e-mail: dr.rusuladnan@uomustansiriyah.edu.iq Abstract. We have studied in this work the effect of deposition time on the absorption spectra and the optical energy gap of CdS thin film. That prepared by chemical bath deposition method (CBD) on glass substrate at temperature of (80 ± 5)°C. The structural features were examined by X-ray diffraction (XRD) is wurtzite structure for all samples. Transmittance spectra have been recorded in order to determine absorbance, reflectivity, absorption coefficient and the optical constants such as refractive index, extinction coefficient, real and imaginary part of dielectric constant. It was seen that all the parameters under investigation affected by deposition time (1,2 3, and 4) hours.

OPTICAL PROPERTIES OF ZnO FILMS PREPARED BY CBD TECHNIQUE

“…Fig. 4 shows the coefficient of absorption (α) decline in photon energy law due to electrical transfer probability between conduction and valence bands is so low and the absorption coefficient will gradually elevate to high energy (ℎʋ >𝐸 𝑔 ) for all samples [18], as the temperature of the annealing increases, the absorption edge changes at blue shift (i.e. shifts to short λs).…”