| Autor: |
Akylbekova A; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Dauletbekova A; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Baimukhanov Z; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Vlasukova LA; Faculty of Radiophysics and Computer Technologies, Belarusian State University, Kurchatova Street 5, 220045 Minsk, Belarus., Usseinov A; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Saduova N; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Akilbekov AT; Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan., Pankratov VA; Institute of Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga, Latvia., Popov AI; Institute of Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga, Latvia.; Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia. |
| Abstrakt: |
We report the results of synthesis of zinc selenide (ZnSe) nanocrystals into SiO 2 /Si track templates formed by irradiation with 200 MeV Xe ions up to a fluence of 10 7 ions/cm 2 . 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/SiO 2nanoporous /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. |
