Annealing Effect on Structural, Optical and Electrophysical Properties of ZnSe Nanocrystals Synthesized into SiO2/Si Ion Track Template
Akylbekova A. Dauletbekova A. Baimukhanov Z. Vlasukova L.A. Usseinov A. Saduova N. Akilbekov A.T. Pankratov V.A. Popov A.I.
August 2024Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2024#17Issue 16
We report the results of synthesis of zinc selenide (ZnSe) nanocrystals into SiO2/Si track templates formed by irradiation with 200 MeV Xe ions up to a fluence of 107 ions/cm2. Zinc selenide nanocrystals were obtained by chemical deposition from the alkaline aqueous solution. Scanning electron microscopy, X-ray diffractometry, Raman and photoluminescence spectroscopy, and electrical measurements were used for characterization of synthesized ZnSe/SiO2nanoporous/Si nanocomposites. XRD data for as-deposited precipitates revealed the formation of ZnSe nanocrystals with cubic crystal structure, spatial syngony F-43m (216). According to non-empirical calculations using GGA-PBE and HSE06 functionals, ZnSe crystal is a direct-zone crystal with a minimum bandgap width of 2.36 eV and anisotropic electronic distribution. It was found that a thermal treatment of synthesized nanocomposites at 800 °C results in an increase in ZnSe nanocrystallites size as well as an increase in emission intensity of created precipitates in a broad UV-VIS spectra range. However, vacuum conditions of annealing still do not completely prevent the oxidation of zinc selenide, and a formation of hexagonal ZnO phase is registered in the annealed samples. The current–voltage characteristics of the synthesized nanocomposites proved to have n-type conductivity, as well as increased conductivity after annealing.
chemical deposition , PL in UV-VIS spectral range , quantum chemical calculation , SiO2/Si track template , thermal annealing , ZnSe nanocrystals
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Faculty of Physics and Technology, L.N. Gumilyov, Eurasian National University, Astana, 010000, Kazakhstan
Faculty of Radiophysics and Computer Technologies, Belarusian State University, Kurchatova Street 5, Minsk, 220045, Belarus
Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga, LV-1063, Latvia
Institute of Physics, University of Tartu, W. Ostwald Str. 1, Tartu, 50411, Estonia
Faculty of Physics and Technology
Faculty of Radiophysics and Computer Technologies
Institute of Solid State Physics
Institute of Physics
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