Comparison of optical and structural characteristics of CdxZn1-xS: Na, Sm/Pr films

This paper reports a detailed investigation on the optical and structural properties of Sm/Pr doped CdxZn1-xS: Na films prepared through chemical bath deposition (CBD) technique in aqueous alkaline bath and their consequent condensation on glass substrates. Results in terms of SEM, XRD, optical absorption spectra, photoconductivity (PC) rise and decay and photoluminescence (PL) emission spectra are presented and discussed for CdxZn1-xS: Na, Sm/Pr films prepared on glass substrates at 60 degrees C in a water bath (WB). SEM studies show fibre type structures, which are related to layered growth. XRD results show prominent diffraction lines of CdS and ZnS along with lines of impurity. From results of optical absorption spectra, the band-gap values are determined, which are comparable with those obtained from PL emission spectra. Sufficiently high photo current (I-pc) to dark current (I-dc) ratios with a maximum value of the order of 10(6) are observed.