Preparation And Characterization Of Chemically Deposited Rare Earth Doped Nanocrystalline CdSe FILMS

Abstract

Semiconductor nanoparticles doped with metal ions are studied extensively because of their excellent luminescence properties. Semiconductor thin films gives better results over microcrystalline thin film. Development of nanocrystalline thin films reduces the size of the electronic devices and enhances the efficiency. Doping is widely used method which control optical and electrical properties of semiconductors. Scientist and researchers concentrate on improving optical and electrical properties of doped nanocrystalline CdSe thin films and improve the performance of the devices. Rare earth ions doped semiconductiong nanoparticles are widely used in display devices, solar cell energy, lighting technology, remote sensing etc. newlineCadmium selenide (CdSe) is a II-VI group compound semiconductor material. CdSe has direct band gap with high absorption coefficient near the band edge, which allowes its use in thin film devices; it is mainly interesting for the applications in solar hybrid systems. newlineThe thesis presents an extensive effort on the preparation and characterization of undoped and rare earth neodymium (Nd) and samarium (Sm) doped CdSe nanocrystalline thin films by chemical bath deposition method. Since last four decades much work is going on transition metal doped CdSe nanocrystalline thin film. Based upon eminent luminescence properties, applications of CdSe nanocrystalline thin films, and its benefit over other material, objective of the present work was outlined. Review of literature related to effects of doping and various preparation techniques reported by other researchers and their efforts to improve the properties of CdSe nanocrystalline thin film were compared to determine method for problem undertaken. This would be probably the first attempt to prepare undoped and neodymium (Nd) /samarium (Sm) doped CdSe nanocrystalline thin films by chemical bath deposition, without use of capping agents. Work was intended to understand effect of doping hence measurement of different optical and electrical properties on