PCSS, V.4, N4, 2003

Abstracts

М.О. Galushchak

The Feature of Defect Formation Mechanisms on A^IVB^VI Compounds Semiconductor Films
(Review)

Ivano-Frankivsk National Technical University of Oil and Gas,
15, Karpatska Str., Ivano-Frankivsk, 76019, Ukraine

Influence of inlying mechanical tensions, and also remaining oxygen on processes of defect formation in films of lead chalkogenides, grown on different substrates is considered. It is cleared up mechanism of formation of metallic phase in case of films growing from the vapour phase. A kinetics of surface concentration of electrons taking into account the complex formation of own defects with oxygen is considered.

A.D. Zamkovets, S.M. Kachan, A.N. Ponyavina

Optical Properties of Thin-Film Metal-Dielectric Nanocomposites

Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus,
70, F. Skaryna Av., Minsk, 220072, Belarus, E-mail: ponyavina@imaph.bas-net.by

The method for preparation of metal-dielectric nanocomposites with a layered periodic subwavelength structure is proposed. For systems containing silver and copper nanoparticles monolayers the influence of interlayer parameters on transmission/reflection spectra, as well as their absorbency over the spectral range of the surface plasmon frequency has been established and investigated. The quantitative description of the experimental data is made on the base of the statistical theory of multiple scattering of waves.
Key words: metalline nanocomposite, surface plasmon, photonic crystal.

V. Kasiyanenko, V. Martyniuk

Features of a Structure of a Zone of Conductivity in High-temperature Сeramics of System 1:2:3 alloying K and Zn

Vinnytsya State Technical University
95, Hmelnytsk Road, Vinnytsya, 21021, Ukraine

With the purpose of understanding of a parity between baric and copper stehiometry, electronic structure, the volumetric maintenance of phases and temperature of transition in a semi-conductor condition in system 1:2:3, we have lead alloying for х=25 on potassium and zinc. The results received by us, provide an estimation T_c and enable to connect its size with electronic structure. Our analysis testifies that possible value T_c depends from structure f-conditions in a zone of conductivity. Also influence on temperature of semi-conductor transition of replacement in cation to a sublattice is revealed which is caused by possible influence segregation phases of separate elements on phase structure on border of a grain is revealed. The analysis of features of zoned structure which is carried out by us on the basis of theoretical calculations, provides, that Tc depends on density of electronic conditions near to level Fermy N(E_F). Comparing experimental and theoretical results, we came to a conclusion, that for reception of a full power spectrum of a zone of conductivity it is necessary to take into account influence of discrete - electronic effects on unit in atom of Ва.

O.Y. Anan’yina, A.S. Yanovs’ky, A.P. Kotlyarov

Simulation of Atomic Hydrogen Interaction with Vacancy Defect on Ge(100) Surface. SSEM

Zaporizhzhya State University,
66, Zhukovsky Str., Zaporizhzhya, 69063, Ukraine, Email: ananyina@zsu.zp.ua

The results of quantum-chemical calculations of hydrogen adsorption and desorption processes on clusters, simulating vacancy defect on Ge(100), are presented in the work. The possible reaction mechanisms at different coverage of such surfaces by dihydride and monohydride chemisorption phases are discussed. The comparison of simulation results with experimental data for ordered and disordered Ge surfaces is carried out.

A. Savitskjy, Ye. Nykonyuk, O. Parfenyuk, M. Ilashchuk, P. Fochuk, P.Feichuk

Cd_1-xZn_xTe Crystals Photoelectric Properties, Grown by High Ar Pressure

Chernivtsi National University,
2, Kotzyubynskiy Str., Chernivtsi, 58012, Ukraine,
Phone: +380(372) 58-47-45; fax: +380(372) 55-18-05, E-mail: fochuk@chnu.cv.ua

Characteristics of CdTe and Cd_1-xZn_xTe (x<0,2) single crystals, grown by HPBM at different synthesis conditions and with Ar pressure of 60-120 atm in PHASE laboratory (CNRS, Strasbourg), were studied. At lower Ar pressure (60-70 atm) and preliminary synthesis with following overcharging in another ampoule it is possible to get low-resistance p-type crystals, similar to traditional Bridgman method. The semiinsulating CdTe and Cd_xZn_1-xTe (x<0.2) bouls can be grown (without overcharging) at P_Ar>120 atm. By photoelectrical measurements positions of 5 deep levels (0.5; 0.8; 0.93; 1.23; 1.42 eV) were determined. The bulk uniformity of semiinsulating crystals was worse.
Key words: semiconductors, crystal growth, deep levels, photoelectrical properties.

V.I. Prysyazhnyuk, O.G. Mykolaychuk

Structural Features, Kinetics of Crystallization and Physical Properties of GdFe₂-films

‘Ivan Franko’ L'viv National University,
Physical Department, Chair of Physics of metals,
8а, Kyryla & Mephodiya Str., L'viv, 79005, tel. 96-43-06, E-mail: prysyazhnyuk@wups.lviv.ua

Amorphous and crystalline films of GdFe₂-compounds were obtained. Influence of the technology of receiving on a films structure and the kinetics of crystallization for amorphous films is investigated. The temperature dependences of conductivity and thermoelectric power for GdFe₂-amorphous films are obtained.

Ya.P. Saliy, R.Ya. Saliy¹

Space Correlations Effects in the Processes Controled by Atom Capture

‘Vasyl Stefanyk’ Precarpathian University,
57, Shevchenco Str., Ivano-Frankivsk, 76025, Ukraine,
¹‘Taras Shevchenko’ Kyiv National University,
64, Volodymyrska Str., Kyiv, 0017, Ukraine

In the present paper some effects of many - particle correlations A+B->A are considered. The influence of sink distribution upon the space distribution of immobile and mobile atoms and their capture rates have been studied.

S.I. Drapak, V.М. Kaminsky, Z.D. Kovalyuk, V.V. Netyaga, V.B. Orletskyy

The Influence of Hydrogen on Electrical Properties of Contact Sn-p-InSe

Chernivtsi Department of Institute of Materials Sciences Problems NAS of Ukraine,
5, Iryna Vilde Str., Chernivtsi, 58001, Ukraine

ДThe influence of hydrogen intercalation on indium monoselenide is investigated measuring electrical properties of based on it photosensitive structures to metal-insulator-semiconductor (MIS) and Mott diode (MD). It is established that intercalation of the basic semiconductor with hydrogen leads to the improvement of diodic properties of the MIS structures whereas those for the DM structure becomes worse. For the both structures current transport mechanisms are analyzed on the basis of their band diagrams.

S. Vashkevych, М. Berkeschuk, О. Poplavskiy

Influence of Heat Treatment and Electronic Irradiation on Element Composition of Films MgO

Vasyl Stefanyk Prekarpathian University, Physical Faculty,
201, Galytska Str., Ivano-Frankivsk, 76008, Ukraine

Research of films MgO was conducted by the method of Ouge-electronic spectroscopy. In work the films MgO were explored got the method of high-frequency dispersion under various conditions (in the environment of argon and in the environment of argon with oxygen). Computations of quantitative element composition of films were conducted on the basis of the program, developed in a programming language Delphi 5.0. Authenticity of computations was checked up by means standard samples of high cleanness. The use of the program considerably simplified work. It is exposed, that in films of got in the environment of argon there is violation of stoichiometric composition in the side of surplus of magnesium, and films were got in the environment of argon with oxygen of violation of stoichiometric insignificant.

B. Andriyevsky, A. Patryn

Dispersion of Refractive Index of Dielectrics as a Basis for Reconstruction of Fundamental Absorption Spectrum

Technical University of Koszalin, Faculty of Electronics,
17, Partyzantów Str., Koszalin, PL-75-411, Poland

The method for reconstruction of the material’s absorption spectrum k(w') in the range of fundamental excitations (w') on the basis of the refractive index dispersion n(w) in the range of its transparency has been elaborated and applied to the investigation of ferroelectric crystal TGS. The deviation of the refractive index dispersion of TGS crystal from the expected behavior can be explained by the change of dispersion relation caused by the interaction of optically active valence electrons. Temperature dependence of the parameters of this interaction in the region of phase transition of TGS crystal (Tc=49^oC) is discussed.
Keywords: absorption spectrum, refractive index, phase transition.

O.V. Galochkin, S.G. Dremluzhenko, Y.D. Zakharuk, A.I. Rarenko, E.V. Rybak, V.M. Strebezhev

Surface and Interface Investigation of Structures Created on Cd_1-xZn_xTe and Cd_1-xMn_xTe by Laser Melting

Chernivtsi National University by Yuriy Fedkovich,
2, Kotsyubynskiy Str., Chernivsi, 69063, Ukraine, Е-mail: microel@chnu.cv.ua

The surface morphology and structure of melting layer of Cd_1-xZn_xTe, Cd_1-xMn_xTe solid solution irradiated by ruby laser has been investigated by scanning electron microscope method. It has been shown the possibility of ohmic contacts creation by laser melting of subcontact layer.

V.V.Ivchenko¹, A.N.Sergeev¹, V.S.Elnik¹, and N.M.Chuiko²

Absorption Edge of Cadmium Arsenide

¹Kherson State University, Chair of Physics,
27, 40 Rokiv Zhovtnya Str., Kherson, 73000, Ukraine,
Phone: +380-0552-326768, E-mail: ivchenko@ksu.kherson.ua
²Kherson State Technical University, Department of Cybernetics,
24, Berislavske Shosse, 73008, Kherson, Ukraine,
Phone: +380-0552-516332, E-mail: chuiko@public.kherson.ua

The experimental data of the Cd₃As₂ absorption edge at low temperature are analyzed for single crystals. The anisotropic Bodnar band model is used to calculate the absorption coefficient. The best fit of the theoretical curve to experimental points is found for the following band parameters: e_g=-0,1 eV, D=0,33 eV, P=8·10^-10eV·m, д=0,12 eV. The effect of linear in wave vector term in the dispersion equation on the fine structure of the optical absorption spectrum is also discussed.
Keywords: cadmium arsenide, electronic band structure, Bodnar model, dielectric function, optical transitions, spin splitting of bands.

A.D. Pogrebnjak¹, О.P. Kul’ment’eva^1,2, A. Marcu³, A. Lebed²

Production Mono- and Two-Layers Films on the Base of + YBa₂Cu₃O_7-X Using Laser Plasma Ablatio

¹Sumy institute for modification of surface,
87, Romenskaya Str., bild. М, PO box 163, Sumy, 40030, Ukraine;
ph. (054-2) 21-28-16, fax (380 542) 22-03-38; E-mail: apogrebnjak@sіmp.sumy.ua/a>
²Sumy State University,
2, R.-Korsakov Str., PO box 227, Sumy, 40030, Ukraine;
ph. (054-2) 33-90-18, E-mail: opkulm@ukr.net
³Institute of Atomuc Physics, Romania

The results of deposition films of high-temperature superconducters on a base YBa₂Cu₃O_7-X from ablation plasma by the pulse laser influence, which directed with help special reflector and a mask on the substrate are submitted. It’s shown, that quality of films the arrangements of a substrate and thickness of a film depend on a corner of plasma reflection. The surface morphology of films is investigated and are determined the roughness and thickness of the film depending on a corner of reflection ablation plasma.

M.M. Slyotov, Ya.N. Barasyuk, M.V. Demych, A.G. Buzhnyak, V.G. Tomin

Optical Properties of the Surface Modified Layers CdTe<O>

Yriy Fedkovych Chernivtsy National University,
2, Kotsubynskyy Str., Chernivtsy, 58012, Ukraine,
tel: (03722) 44221, E-mail: oe-dpt@chnu.cv.ua

Optical propertys’ of the surface layers of cadmium telluride is investigated. It is shown that the annealing of the crystals lead to the emerging of the modified layers. The geometrical and the physical properties of the layers determine by the isovalent impurity of the oxygen.

O.N. Yurchenko¹, I.D. Olekseyuk¹, S.S. Novosad²

Luminescent Properties оf СdI₂ Single Crystals, Doped with СuІ₂

¹‘Lesya Ukrainka’ Volynj State University,
13, Voli Av., Lutsk, 43025, tel: (03322) 48427, E-mail: yurchenko@lab.univer.lutsk.ua
²Ivan Franko Lviv National University,
50, Dragoanov Str., Lviv, 79005, Ukraine

The researches of radiation spectra of CuІ₂-doped and pure CdІ₂ single crystals are performed at X-ray and laser excitations.

О.S. Chernyuk¹, Z.F. Tomashik², V.I. Grytsiv¹, V.M. Tomashik², V.M. Kashpor¹

Chemical Interaction of GaSb and GaAs with the Etching Compositions of the HNO₃-HBr(HCl)-H₂O Systems

¹I. Franko Zhytomyr Teaching University,
40, V. Berdychivs’ka Str., Zhytomyr, Ukraine; e-mail: chernuk@ukr.net
²V.Ye. Lashkaryov Institute for Semiconductor Physics of National Academy of Sciences of Ukraine,
41, av. Nauki, Kyiv, Ukraine; e-mail: tomashyk@isp.kiev.ua

Kinetics and mechanism of chemical interaction of GaAs and GaSb with the solutions of the HNO₃-HBr(HCl)-H₂O systems in reproducible hydrodynamics conditions has been investigated. The main regularities of chemical etching of mentioned above semiconductor compounds were determined and surfaces of equal etching rates were built. The influence of the HBr/HNO₃ ratio in the solutions HBr-HNO₃-H₂O on the GaAs and GaSb etching rates has been determined also. The reason of elementary antimony formation on the surface of GaSb at its chemical etching in the solutions HBr–HNO₃–H₂O were determined using the measurements of self-dissolution potentials of GaSb, Sb and Ga in the such ethicng compositions.

D.M. Freik, І.M. Ivanyshyn, L.Y. Mezhylovska

Nonstoichiometry and own point defects of tin telluride

Vasil Stefanyk’s Precarpathian University,
57 Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

The analysis of defect states at the mechanisms of nonstoichiometry and selfdoping in Tin Telluride by the crystalloquasichemical method at the condition existing of doubly- and quadri charged Tin vacancies is made.

Z.F. Tomashik, E.M. Lukiyanchuk, V.M. Tomashik

Chemical Etching of the InAs and GaAs Single Crystals in the Solutions of the H₂O₂-Unorganic Acid Systems

‘V.E. Lashkarev’ Institute of Semiconductor Physics of NAS Ukraine,
41, Nauky Av., Kyiv-28, 03028, Ukraine ; E-mail: tomashyk@isp.kiev.uaa

The nature of chemical dissolution of InAs and GaAs single crystals in the solutions of the H₂O₂-HNO₃, H₂O₂-H₃PO₄, H₂O₂-HCl and H₂O₂-H₂SO₄ systems in reproducible hydrodynamics conditions has been unvestigated. The main pecularities of chemical etching of these semiconductor materials and concentration regions of solutions which can be used for the development of etching compositions fot the chemico-dynamic polishing of InAs and GaAs were determined.

R.M. Holomb

The Frequencies Spectrums by Quantum-Chemical Calculations of Ge_nS_m Clusters (n = 2, m = 3, 5-7; n = 4, m = 3)

Uzhgorod national University, 32, Voloshyn Str., Uzhgorod, 88000, Ukraine, E-mail: mitsa@univ.uzhgorod.ua

The atomic configurations, total energies, formation energies and vibration spectrums of Ge_nS_m clusters are calculated by ab initio method. The formation energies of Ge_nS_m chain clusters are decreasing with increasing of chain length. Among the tetrahedral clusters greatest formation energy has cluster with Ge-Ge bond. The base line in Raman spectrums of chain clusters is at 348 сm^-1 and does not depend on length and type of final atoms of chain. The most intensive line of tetrahedral clusters shifts from 333 up to 380 cm-1 in the next order: Ge₂S₇H₆, Ge₂S₆H₄, Ge₂S₆H₆. The feature of Raman spectra of e₂S₆H₆ cluster with Ge-Ge bond is presence of band at 250 сm^-1 and that’s one of edge sharing tetrahedrons GeS_4/2 (cluster Ge₂S₆H₄) – line at 424 сm^-1.

T. Tatarchuk, G. Boyko, S. Lisnyak, D. Protskiy, N. Orynchuk

Crystalquasichemical Investigation of Influence of Admixtures on Reactionary Ability of Hematite

Vasyl Stefanyk Precarpathian University,
57, Shevchenko Str., Ivano-Frankivsk, 76000, Ukraine

In the article the influence of donor (Li₂O, MgO) and acceptor (TiOsub>2) impurity on the nature and concentration of defects in hematite is explored. Reactionary ability Fe₂O₃ was determined by concentration of ions Fe⁺³ in water solution of salt acid. It is set, that regardless of nature of defects reactionary power of intercalating exemplars, higher it is comparatively with own reactionary power of hematite. The mechanism of action of admixtures is first grounded on the basis of chemistry of semiconductors from positions of the charged localized and nonlocalized defects.

A.A. Druzhinin, I.I. Maryamova, O.P. Kutrakov, I.V. Pavlovsky

The Effect of Strain on the Impurity Conductivity of Silicon Whiskers in the Range of Metal-Insulator Transition

National University “Lvivska polіtechnika”, Sci.-Research Center “Crystal”,
1, Kotlyarevsky Str., Lviv, Ukraine, 79013,
Tel.: +38 (0322) 721632, E-mail: druzh@polynet.lviv.ua

The effect of strain on the impurity conductivity of boron doped silicon whiskers in the wide temperature range 1.7-300 K and in the magnetic field up to 14 T was studied. It was shown that the peculiarities of strain-induced changes of resistivity of silicon whiskers reveal them self in the region of metal-insulator transition at liquid helium temperatures as in the presence of magnetic field and in the absence of magnetic field. The effect of strain on the changes of activation energies for impurity conductivity was analyzed also.

T. Boczar, P. Frącz, D. Zmarzły

Analysis of the Light Radiation Spectra Emitted by Electrical Discharges in Insulation Oil

Technical University of Opole, Poland

The paper presents the measurement results of the optical spectrum of the light emitted during disruptive electrical discharges in the plane-point system. Optical spectra are presented for the electrode of various point inclinations. The measurements were taken using a spectrometer with a diffraction grating with a semiconductor CCD. An interpretation is presented of the occurrence of extrema in optical spectra coming from the change of energetic state of elements that are part of an electrode and occur as a result of free gas generation. For comparison, the optical spectrum run for electrical discharges of the surface type is presented. Keywords: optical spectrum, electrical discharge, surface.

V.V. Brailovsky, P.P. Vatamanjuk, P.M. Shpatar

Registor of Capacity of the Parametrical Capacitor with System PLL

Chernivtsy National University, Radio Engineering dept.,
2, Kotsubynskyy Str., Chernivtsi, 58000, Ukraine

The registor with system PLL is intended for measurement of capacity of the parametrical capacitor by a resonance method. The basic parameters of the registor, theoretical estimations and circuit realization are investigated. Sensitivity of measurement of capacity is 0.1 fF.

A.І. Kostrjіtskіy, E.N. Naumova

To a Problem on Sіmulatіon of a Physіco-Chemіcal Sіtuatіon in Pores of Cathode Coatіngs on Steel

Odessa Natіonal Academy of Food Іndustry,
112, Kanatna Str., Odesa, 65039, Ukraіne,
phone (0482) 29-11-31, E-mail: profAIK@ipss.net

The phenomenologіcal model of germіng and development of local corrosion locuses іn pores of cathode coatіngs on steel іs offered. Іn the fundamentals of thіs model the mechano-chemіcal mechanіsm of development of corrosіon processes іn tіghtly deformed metal іs fіxed. At a stage of corrosіon seat germіng іt іs necessary to take іnto account the electrochemіcal heterogeneіty of a surface. Іt is offered to take іnto account a joіnt actіon of the electrochemіcal and mechanіcal factors, and also strength loss actіon of hydrogen for an estіmatіon of a physіco-chemіcal sіtuatіon іn corrosion seat. The design formulas for an estimation of the contribution of separate corrosion seats in a general picture of electrical fields forming near to a surface of porous cathode coating are offered, the features of electrode processes flow in pores of coatings of different width are discussed.

S.V. Kozytckyy, V.P. Pysarskyy¹, D.D. Polishchuk¹

Peculiaryties of Obtaining of ZnS-polycrystals by means of Self-propagating High-temperature Synthesis

National Sea Academy,
8, Didrikhson Str., Odessa, 65029, Ukraine Email: mech@ma.odessa.ua,
¹’I.I. Mechnikov’ National University,
2, Dvoryanska Str., Odessa, 65000, Ukraine Email: Pysvitp@te.net.ua, Vovchyk@ukr.net

The mechanism of reaction and formation of ZnS by means of Self-propagating High-temperature Synthesis (SHS) method was investigated. A mixture of Zn and S powders was pressed forming a cylinder that was placed in a high-pressure vessel filled with inert gas. Polycrystalline ZnS was formed as a result of propagation of the front of chemical reaction along the initial mixture. The heat released in chemical reaction produced melting of initial components, and high pressure stimulated reaction in liquid phase. The quality of product and completeness of chemical transformation is definite function of pressure. The qualitative ZnS may be obtained when pressure in vessel is above 4 MPa – in this situation we got the final product with completeness of chemical transformation 99.5%. The mechanism of luminescence in SHS - ZnS (polycrystalline) is the same as for the monocrystalls. We suppose that SHS-ZnS may be used as a luminofor.

L.M. Zaychenko, A.I. Seredyuk¹, V.D. Fotyj²

Physical-Chemical Particulates of Fe-Electrodes Fabrication and tem using for Ni-Fe-Batteries

OAC “Quartz”, 246, Golovna Str., Chernivtsy,
¹Lviv department of current sources IPM NAN, 1, Patona Str., Lviv,
²DTB “Foton-Quartz”, 246, Golovna Str., Chernivtsy

Physical-chemical and technological particulates of submicrone Fe–powder fabricate for Ni-Fe-batteries was explored. Technologies carbon and hydrogen reconstruction of iron and defects Ni-Fe system by comparison with Ni-Cd system was investigated. Reasons of spontaneous loss capacity of Fe–electrodes were investigated. Technology fabricated of Fe–active mass and stabile electrodes was offered.

A.M. Nicolenko

New Problem of Physics and Chemistry of Solid State: Mesoscopical Disordered Medium

‘O.Ya. Usykova’ Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine
12, Proskury Str., Kharkiv, 61085, Ukraine

The issue of the day modern materialoznavstva are up to the so called consolidated materials and dispersion systems, that are initial raw material of their synthesis, and the condensed tverdofazni systems are the basic object of researches of physics and chemistry of solid (from point of materialoznavstva-compactni there are materials). This situation generates the definite conflict between the noted disciplines, conditioned by disparity in determination of basic object of researches, and this same formulates the problem of revision of maintenance of notion „a solid” is that ob–rountovoue necessity of expansion of spectrum of fundamental researches, which is up to the mezoscopichnoi unsettled state. As mezoscopichno lacking amenities environments are studied in different spheres of scientific activity, it follows to examine the outlined problem as migdistsiplinarnou.