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Thin film deposition of PbS is conveniently carried out by chemical reactions of lead acetate with thiourea at room temperature. Energy dispersive analysis of X-ray (EDAX), X-ray diffraction (XRD), selected area electron diffraction patterns (SAED), UV-Vis-NIR spectrophotometer, Scanning Electron Microscopy (SEM), Atomic force microscopy (AFM), Photoluminescence (PL) and Raman spectroscopy techniques are used for characterizing thin films. EDAX spectra shows that no impurity is present and XRD pattern indicates face centered cubic structure of PbS thin films. The average crystallite size obtained using XRD is about 15nm calculated using Scherrer’s formula and that determined from Hall-Williamson plot was found to be 18nm. SAED patterns indicate that the deposited PbS thin films are polycrystalline in nature. Blue shift due to quantum confinement was seen from the UV-Vis-NIR absorption spectra of thin film in comparison with bulk PbS. The Photoluminescence spectra obtained for thin film with different excitation sources shows sharp emission peaks at 395nm and its intensity of photoluminescence increases with increasing the excitation wavelength. Raman spectroscopy of deposited thin film was used to study the optical phonon modes at an excitation wavelength of 488nm using (Ar+) laser beam.

CdSe is a II-VI group semiconducting material with optimum bulk band gap of 1.74eV. It is a promising material due to its wide range of technological applications in optoelectronics devices. CdSe nanoparticles have been synthesized at different temperatures starting from Room temperature to 80°C using appropriate precursor solutions containing Cadmium acetate, Triethanolamine (TEA), Ammonia and Sodium selenosulphate. The pH of Solution was around 10.50 ± 0.10 during synthesis. We confirmed the elemental analysis by Energy Dispersive X-ray Analysis (EDAX) and X-ray Photoelectron Spectroscopy (XPS) technique. X-Ray Diffraction (XRD) studies shows that the synthesized nanoparticles belonged to cubic phase with crystallite size lying between 2nm-4nm. The effect of temperature on particle size, lattice parameter, density of dislocation and strain were investigated. Blue shift of 103nm to125nm has been observed from optical absorption spectra and raman measurements performed at room temperature using He-Ne laser (632nm, 5mW) showed the presence of longitudinal optical phonon modes. Photoluminescence (PL) studies shows a shift of 30nm when compared with the bulk PL emission peak.