Photoconductivity and photoluminescence in chemically deposited films of (Cd0.95-Pb0.05)S: CdCl2,Ce

The results of photoconductivity (PC), photoluminescence (PL), optical absorption spectra, XRD and SEM studies are presented for (Cd_0.95-Pb_0.05)S: CdCl₂,Ce films prepared by chemical bath deposition technique. PC gains ∼10⁷ are found in doped films. PL emission spectrum is found in red region which is related to 5d to 4f transition in Ce. Films prepared at 60°C show better PC while those prepared at room temperature (RT) show better PL. Optical absorption studies show reduction in band gap due to addition of PbS. A peak due to Ce is also observed in absorption spectrum. XRD studies show the presence of both CdS and PbS. SEM studies show presence of microcrystals, cluster of grains along with some rod type structures.