The photoluminescence and optical constant of ZnSe/SiO2 thin films prepared by sol–gel process |
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| Affiliation: | 1. School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia;2. School of Physics, University of New South Wales, Sydney, NSW 2052, Australia;3. Bragg Institute, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia |
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| Abstract: | In this paper, ZnSe/SiO2 thin films were prepared by sol–gel process. X-ray diffraction results indicate that the phase structure of ZnSe particles embedded in SiO2 thin films is sphalerite (cubic ZnS). The dependence of ellipsometric angle ψ on wavelength λ of ZnSe/SiO2 thin films was investigated by spectroscopic ellipsometers. The optical constant, thickness, porosity and the concentration of ZnSe/SiO2 composite thin films were fitted according to Maxwell–Garnett effective medium theory. The thickness of ZnSe/SiO2 thin films was also measured by surface profile. The photoluminescence properties of ZnSe/SiO2 thin films were investigated by fluorescence spectrometer. The photoluminescence results reveal that the emission peak at 487 nm (2.5 eV) excited by 395 nm corresponds to the band-to-band emission of sphalerite ZnSe crystal (2.58 eV). Strong free exciton emission and other emission peaks corresponding to ZnSe lattice defects are also observed. |
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