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Band structure controlled solid solution of spray deposited Cd1-x ZnxS films: Investigation on photoluminescence and photo response properties
摘要： Nano crystalline Cd1-xZnxS (x=0.00-1.00 at. %) films were deposited on glass substrates through conventional chemical spray pyrolysis method at different temperatures. The films with x< 0.70 have exhibited hexagonal phase beyond which cubic phase was noticed. The shifting of XRD peaks with higher Zn content, confirmed the formation of Cd1-xZnxS solid solutions. The film crystallinity improved at higher deposition temperatures, while it decreased with increasing x. SEM images showed nearly spherical granular shapes for x=0, which gradually deteriorate in size at higher x and changed to fibrous structure for x>0.60. Further the films with x=0.40-0.60 seem to be porous and well-suited for gas sensing applications. The EDS confirmed the presence of Cd, Zn and S with expected stoichiometry. The optical transmittance and the energy band gap increased with increasing temperature and x. The shift of absorption edge to the shorter wavelength with Zn content has made film high transparent in blue region. The extinction coefficient reduced with x and Urbach energy has shown the formation of defects. Photoluminescence spectra exhibited broad emission bands which could be deconvoluted to multiple peaks attributable to defect states. The film resistivity increased with x that resulted in decrease of carrier concentration which was determined through Hall Effect measurements. The crystallinity was found to influence the photo-response of the films. The films with high Cd contents showed excellent photo response which can be used as photo-detector due to its rapid decline of resistance in the band edge region. The smaller grain and fibrous structured films with large open surface area obtained here, can be used in gas sensing while, the films with x>0.60 are well-suited for the fabrication of window layers of solar cells.
关键词： structure properties,CdZnS thin films,photo response,optical properties,resistivity,photoluminescence
更新于2025-09-23 15:19:57
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Influence of cadmium precursor concentrations on the structural, optical and electrochemical impedance properties of CdZnS thin films
摘要： Thin films of cadmium zinc sulfide (CdZnS) were deposited on microscopic glass substrates using the chemical bath deposition method and the effects of the Cd precursor concentrations on the morphological, structural and optical properties of the films were studied. The surface morphology as revealed by scanning electron microscope showed closely packed nano particles randomly spread on the surface of the glass substrates. The x-ray diffraction studies showed that the thin films were polycrystalline and the crystallite size decreased with increase in the concentration of the Cd precursor. While the optical absorbance decreased, the bandgap energy increased as the concentration of the cadmium source increased. Electrochemical studies were performed by cyclic voltammetry analysis and impedance measurements at low frequency ranges. Simulation model on the impedance model was carried out to obtain a more quantitative analysis of the data. The ternary CdZnS thin film developed in this work could be useful as window layer in solar cell fabrication.
关键词： electrochemical impedance properties,optical properties,chemical bath deposition,structural properties,CdZnS thin films,cadmium precursor concentrations
更新于2025-09-11 14:15:04