STRUCTURAL, ELECTRICAL AND OPTICAL INVESTIGATIONS OF CdSe NANOPARTICLES

摘要

Cadmium selenide nanoparticles are grown on to glass substrate by using chemical bath deposition method at room temperature. The samples are annealed in air for 4h at various temperatures and characterized by structural, electrical and optical properties. The as-deposited CdSe nanoparticles are in cubic phase with optical band gap ‘Eg’ 2.3eV and electrical resistivity of the order of 108Ωcm. After annealing meta stable nanoparticles cubic phase transformed into stable polycrystalline hexagonal phase. Depending upon temperature, decease up to 0.6V and 103Ωcm were observed in the Eg and electrical resistivity, respectively. These changes have been attributed to the increase in the grain size of the CdSe nanoparticles. Optical absorption studies have been recorded. Dependence of optical band gap on crystallite size has also been studied.