Preparation of Cds Nanocrystalline Thin Film by Chemical Method: The Effect of Molarity on Structural and Optical Properties

CdS Nanocrystalline Thin Films are prepared on cleaned glass substrate by Chemical Bath Deposition (CBD) method using polyvinyl alcohol (PVA) as matrix solution at room temperature. Structural characterization performed by X-Ray Diffraction (XRD) exhibits that the films are polycrystalline and cubic structure and the size of nanoparticles are within 7nm. The size and distribution of the crystallites are controlled by varying the molarities of the solution. The surface morphology of the films have been observed by TEM. The optical investigation performed by means of UV Spectrophotometer shows a blue shift of energy compared to its bulk value due to quantum confinement effects of electrons and holes.