Abstract: Using chemical bath deposition (CBD) technique, (Cd-Zn)S thin films were prepared on glass substrates Photoconductivity rise and decay spectra was obtained for different ratio of cadmium and zinc. The absorption coefficient (a) was determined from the absorption using (uv-vis spectrophotometer) at a normal incident of light in the wavelength of range (400-1000)nm. We find that the films have energy gap between (2.8ev-3.09ev) and (a=104 cm-1) means the direct type of transmission.

Keywords: Photoluminescence, Chemical Bath Deposition, Thin Films, CdS.