Preparation and Luminescent Properties of α-ZnSe Heterolayers with Surface Nanostructure

Authors M.М. Slyotov , O.S. Gavaleshko, O.V. Kinzerska

Yuriy Fedkovych Chernivtsi National University, 2, Kotsubinskiy Str., 58012 Chernivtsi, Ukraine

Issue Volume 9, Year 2017, Number 5
Dates Received 28 July 2017; published online 16 October 2017
Citation M.М. Slyotov, O.S. Gavaleshko, O.V. Kinzerska, J. Nano- Electron. Phys. 9 No 5, 05046 (2017)
DOI 10.21272/jnep.9(5).05046
PACS Number(s) 61.46. – w, 68.37.Ps, 78.30.Fs, 78.55. – m
Keywords Zinc selenide of hexagonal modification, Optical reflection, Luminescence (24) , λ-modulation.
Annotation A modified surface on -ZnSe heterolayers was prepared by chemical treatment in H2SO4:H2O2 etchant. Visual observation with microscope magnification 150× and AFM-topograms made it possible to determine the geometrical surface structure which is composed of nanocrystals – pyramids of various size from 20 to 100 nm. Photoluminescence studies revealed high quantum efficiency   15 ÷ 20 % and two radiation spectrum components. In the range of photon energies ħ  Eg (Eg  2.89 eV at 300 K) the wide band with a maximum at ħm  3.24 eV is attributable to quantum size effects. The component at ħm  2.72 eV is formed by radiation on pyramids of large size and determined by interband transitions of free charge carriers and the dominant annihilation of bound excitons. The properties are characterized by temporal and temperature stabilities.

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