Ms. Yevheniia Chernukha Profile

Yevheniia Chernukha

at National Taras Shevchenko Univ of Kyiv

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Proceedings Article | 16 March 2015 Paper

Optical and electronic properties of Si ion implantation of silver atoms

Yevheniia Chernukha, Vasyl Stashchuk

Proceedings Volume 9359, 93591O (2015) https://doi.org/10.1117/12.2078163

KEYWORDS: Ions, Silicon, Silver, Ion implantation, Chemical species, Ellipsometry, Absorption, Reflection, Crystals, Surface roughness

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Optical and electronic properties of monocrystalline silicon modified by ion implantation of silver (Ag+) at energy 75keV with different concentration: D1 = 10¹⁴ ion / sm², D₂ = 10¹⁵ ion / sm², D₃ = 10¹⁶ ion / sm² were investigated at room temperature used angularand spectral ellipsometry methods. While an experiment was carried out ellipsometry parameters Δ and ψ depends of angle of incidence (angular ellipsometry) and wavelengths (spectral ellipsometry). The refractive and absorption indexes, reflection index R(hν ) , permittivity ε (hν ) and optical conductivity σ ( hν ) were calculated using these parameters. The angular dependence of ellipsometric parameters was investigated using the serial ellipsometer LEF-3M-1 with the working wavelength 632,8 nm and a range of angles of incidence changes 65-80°. The samples' surface were explored across a broad spectral range λ=0,23 - 2,8nm (hv=0,44 - 5,39 eV) by the Beatty’s spectral ellipsometry method. In the work was compared the optical conductivity of pure Si and Si with different concentration Ag+. It is established that an increase in radiation dose observed a general shift of the bands in the direction lower energies. High intensity irradiation silver ions lead to a significant increase in surface roughness of single-crystal silicon, creating a large number of vacancies and may forms a further area at the bottom of the conduction band of silicon.

Proceedings Article | 1 May 2014 Paper

Spectral ellipsometry studying of iron's optical and electronic properties

Yevheniia Chernukha, Vasyl Stashchuk, Olena Polianska, Olexsandr Oshtuk

Proceedings Volume 9132, 91321B (2014) https://doi.org/10.1117/12.2051965

KEYWORDS: Iron, Crystals, Absorption, Liquids, Liquid crystals, Electrons, Ellipsometry, Data modeling, Optical properties, Chemical species

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Fe’s optical and electronic properties were investigated at room temperature in different structural states. The sample’s surface was explored in wide spectral range λ = 0,23−17,0 μm (E = 4,96 − 0,07 еV ) by the Beatty’s spectral ellipsometry method. While an experiment was carried out ellipsometry parameters Δ and ψ were measure near the principal angle of incidence. The refraction index R , permittivity Ɛ and optical conductivity σ( hν ) , that is proportional to the interband density of electronic states, were calculated using these parameters. Fe’s optical conductivities in liquid, amorphous and crystalline states were compared in this work. The optical conductivity was calculated using the published data of the iron’s density of electronic states in crystalline, amorphous and liquid states for the comparison of the experimental and theoretical results. It is shown that, at structural transformations “amorphous, liquid state– crystalline state”, the optical properties of metallic iron are determined, in the first turn, by the nearest neighborhood, and the electronic structure is not subjected to significant modifications.

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