Peter Marjanovych Lytvyn

• PhD
• Head of Department at National Academy of Sciences of Ukraine

The principles of formation of micro- and sub-microrelief structures using traditional contact lithography exploiting a phototemplate are compared with the approach of direct laser recording. The disadvantage of conventional contact lithography is the phototemplate damage, which limits the number of patterns that can be recorded using it. The persp...

Asymmetric sulfur‐terminated compounds (STC) and allyl‐terminated compound 2‐(4‐butoxyphenyl)‐1,3‐dimethylcyclo‐hepta[c]pyrrole‐6(2H)‐thione (ATC) dyes are deposited by evaporation in vacuum (PVD) on glass and gold (Au) substrates. Au is deposited by PVD on a rotating glass disk as a thin layer of nanoparticles (NPs), which exhibited a plasmon band...

Kelvin Probe Force Microscopy and Scanning Spreading Resistance Microscopy measurements of hydrogen-doped polycrystalline ZnO films deposited by RF magnetron sputtering with addition of methane have shown that doping of the grain boundaries is higher than that of grains, so that the current flows preferably along the grain boundaries. Current–volta...

416 dowloand of the paper concerned dye polymerization in gas phase

Vanadium oxide thin films were fabricated using a multi-step deposition process involving magnetron sputtering and sequential annealing. The structural, vibrational, and nanomechanical properties of the films were investigated to elucidate the impact of phase composition on the performance of metal-insulator phase transition (MIT). X-ray diffractio...

Polytetrafluoroethylene (PTFE) films are deposited in parallel and perpendicular magnetic fields (MF) by electron‐enhanced vacuum deposition (EVD) and EVD + low‐temperature plasma (LTP) methods. The structure, morphology, and nanomechanical properties of the films are studied by infrared spectroscopy (IRS), atomic force microscopy (AFM), and spectr...

Our work aims to investigate the influence of substrate bias voltage on the structure, optical, and electrical properties of ZnO:Al thin films deposited on Si (100) and glass substrates by radio frequency magnetron sputtering. We have applied the layer-by-layer growth method in magnetron sputtering. X-ray diffraction, atomic force microscopy, Raman...

This paper discusses the distance limit of target detection in the infrared (IR) spectrum for targets with different temperatures. Numerical estimations of the relative decrease in the maximum detection range (MDR) with a decreasing temperature contrast of the target relative to the background (ΔT) are presented. It is shown that an order-of-magnit...

We present and generalize the preparation conditions and properties of strongly compensated Ge films grown on semi-insulating GaAs(100) substrates by vacuum evaporation. The films are characterized using high-resolution X-ray diffraction (HRXD), atomic force (AFM) and Kelvin probe force microscopy (KPFM), Raman spectroscopy, electroreflectance, opt...

Ge1−xSnx growth on a new sapphire platform has been demonstrated. This involved the growth of GeSn on Ge/GaAs layers using the algorithm developed. The resultant growths of Ge on GaAs/AlAs/sapphire and Ge1−xSnx on Ge/GaAs/AlAs/sapphire were investigated by in situ and ex situ characterization techniques to ascertain the surface morphology, crystal...

Методом iнтерференцiйної фотолiтографiї на рельєфоутворюючих халькогенiдних шарах As10Ge30S60 сформовано два типи бiґраток з латерально-впорядкованими куполами та лунками. Покриття таких бiґраток шарами алюмiнiю (80 нм), срiбла (70 нм) та золота (10 нм) дозволило отримати два типи SERS пiдкладинок. Методом атомної силової мiкроскопiї дослiджено змi...

Recently, methane has been demonstrated as an effective n-type dopant for ZnO thin films deposited using the RF-magnetron sputtering method. It was shown that the major electrical doping effect of methane is caused by hydrogen released during methane decomposition. This work investigates the origin of the observed increase in conductivity of methan...

ZnO-based wide bandgap semiconductor oxides with a bandgap 3.3 eV have unique optical and electrical properties that make it promising for transparent electronics, optoelectronics and solar cells [1]. Magnetron sputtering (MS) attracts our attention due to the great possibilities for the deposition oxide films with good film adhesion, high depositi...

Методом електронного розпилення графiту отримано нанометровi вуглецевi плiвки на металевих (мiдних, сталевих) та кремнiєвих пiдкладинках. Температура пiдкладок варiювалася вiд 350 до 600 оС з кроком 50 оС, а час напилення – вiд 1 до 10 с. Отриманi вуглецевi плiвки характеризувалися методами раманiвської спектроскопiї, X-променевої фотоелектронної с...

Polymethines containing an allyl group have been synthesized. Their films are produced by physical vapor deposition (PVD) on glass, silicon (Si), gold (Au), polytetrafluoroethylene (PTFE), and nanostructured plastic substrates. Optical spectra recorded during the deposition showed no decomposition of molecules. The influence of dye structure and su...

Boron-doped diamond (BDD) films grown by chemical vapor deposition (CVD) exhibit unique electrical and optical properties owing to the non-uniform uptake of boron dopants across grains. This study utilizes scanning probe microscopy and confocal micro- spectroscopy techniques to elucidate the influence of grain-dependent boron incorporation on the n...

Vanadium oxide (VO x ) thin films are promising materials, exhibiting electrical, optical, and mechanical properties highly tunable by processing and structure. This work uniquely applying atomic force microscopy (AFM) nanoindentation correlated with X-ray diffractometry and Raman spectroscopy structural analysis to investigate the intricate connec...

Germanium films were grown on c-plane sapphire with a 10 nm AlAs buffer layer using molecular beam epitaxy. The effects of Ge film thickness on the surface morphology and crystal structure were investigated using ex situ characterization techniques. The nucleation of Ge proceeds by forming (111) oriented three-dimensional islands with two rotationa...

This work studies photostimulated diffusion of silver, enhanced by a plasmon field, into GeSe 2 thin films. To ensure the excitation of surface plasmon polaritons (SPP) at the interface between Ag and GeSe 2 , silver diffraction gratings substrates were used, on which chalcogenide layers were deposited by thermal evaporation in vacuum. The samples...

Germanium films were grown on c-plane sapphire with a 10 nm AlAs buffer layer using molecular beam epitaxy. The effects of Ge film thickness on the surface morphology and crystal structure were investigated by ex-situ characterization techniques. The nucleation of Ge proceeds by forming (111) oriented three-dimensional islands with two rotational t...

The relationship between internal mechanical stresses, surface morphology, nanoscale electrical properties, and optical characteristics in TiO2, Gd2O3, Er2O3, and SiO2 thin films on SiC substrates was investigated. The oxide films were synthesized using the rapid thermal annealing and analyzed through scanning spreading resistance microscopy, photo...

We have used temperature-dependent photoconductivity (PC) with different excitation wavelengths and intensities to study the photoexcited charge-carrier transport within GeSn/Ge/Si heterostructures. The evolution of the PC spectra with temperature was analyzed between 10 and 200 K. These strained GeSn films were grown with high enough Sn content su...

Elastic strain engineering in the GeSn bandgap structure is an attractive area for designing novel material properties. The linear interpolation of the elastic constants of Ge and Sn is commonly used to estimate their respective values for Ge1−xSnx alloys. This work reveals that Young's modulus of Ge1−xSnx epitaxial layers has a non-monotonic depen...

Magnetron discharge plasma was applied for the synthesis of CNx thin layers using methane and nitrogen gas precursors. Incorporation of nitrogen in the carbon network resulted in dramatic evolution of growth morphology: from “buried” porous layer observed at low nitrogen incorporation, to aligned bundles of nanorods grown perpendicular to the subst...

The creation of aligning layers for the uniform orientation of liquid crystals is an important goal for both, research and application of liquid crystals. For all applications the creation of aligning layers possessing controllable characteristics such as azimuthal and polar anchoring energies, easy-axis of director alignment and pre-tilt angle, in...

Thin polytetrafluoroethylene (PTFE) films are produced by deposition from a gas phase by two methods: electron‐enhanced vacuum deposition (EVD) and EVD + low‐temperature plasma (LTP). Structure, morphology, and composition of the films are studied by IR spectroscopy, atomic force microscopy, and X‐ray photoelectron spectroscopy. They are close to t...

The processes of surface relief formation on GexSe100-x films under their point irradiation by an electron beam have been studied. Electron-induced effects in GexSe100-x films are interpreted in framework of a two-layer charge model. The distribution of the surface potential in the locally irradiated regions of the GexSe100-x film have been establi...

https://authors.elsevier.com/c/1gZb33IYYktGdA Abstract Morphological, structural, and nano-electrical features of the growth defects and sectoral boundaries revealed by selective etching in synthetic boron-doped single crystals of diamond (BDD) and multisectoral plates are characterized by a set of scanning probe microscopy (SPM) methods, confocal...

The interaction of Ge15Se85 amorphous chalcogenide films with an electron beam has been studied. Three ranges of electron irradiation doses, in which a surface relief of various shapes is formed, are found. The presence and persistence of the surface potential for a long time after film irradiation have been established using the Kelvin probe force...

This paper examines the relationship between the groove profile of aluminum gratings and the shape of surface plasmon polariton (SPP) resonances in the angular dependences of specular reflection and −1 diffraction order. Gratings with a period of a = 700 nm were formed on films of As40S30Se30 chalcogenide photoresist by means of interference lithog...

Both first-principles study of the random TiC–NbC solid solutions and experimental investigation of the films in Ti–Nb–C system were carried. The mixing energy, electronic and phonon structures, elastic constants and moduli, hardness, Debye temperature, fracture toughness, dielectric function, electron energy-loss spectra and heat capacity of the r...

The formation of GeSn nanostructures catalyzed by Sn surface droplets during the growth of Ge1-xSnx/Ge/Si(001) heterostructures provide a promising strategy for the growth of high-quality Sn-containing group-IV alloys. The droplet formation is favored by Sn segregation at dislocation cores and diffusion of Sn towards the sample surface. Subsequent...

The influence of microwave radiation (2.45 GHz, 1.5 W cm⁻², up to 80 s) on defects was studied in single crystals of n-6 H-SiC, n-GaAs, and epi-GaAs. The capture cross section of the charge carrier was found to change, and defect complexes were reconstructed because of the growing number of interstitial atoms in the near-surface layer. The correlat...

We demonstrate the potential of using digital stereo micro-photogrammetry for the analysis and modeling of the habit and sectoral structure of real high-pressure high-temperature single-crystal diamonds. A prototype scanning system with a resolution of 5 μm has been implemented based on a digital single-lens reflex camera, making it possible to cre...

The current transfer through a two-layer structure saturated with absorbed water, each layer of which consists of pressed ZrO2 nanoparticles with two sizes (10 and 20 nm), has been studied. The structure was obtained using the isostatic pressing the ZrO2 + H2O powders. The form of current–voltage characteristics inherent to the studied structure, t...

Boron-doped diamond single crystals of cubo-octahedral habit have been obtained by temperature gradient method at high pressures and high temperatures (HPHT) in Fe-Al-B-C system, and multisectoral plates of different orientations have been produced. Spatial distribution of uncompensated boron impurity and surface potential through the interfaces of...

In this paper we investigate the doping effect of FeO and Fe2 O3 on the structural, optical and magnetic properties of ZnO layers prepared by a new stencil-free technique. Samples were characterized by X-ray diffraction (XRD), atom force and magnetic force microscopy, photoluminescence and Raman spectroscopy. A quite high quality of the printed Fe-...

Polytetrafluoroethylene (PTFE) film was deposited in magnetic field by means of heating of bulk PTFE in vacuum with evaporation of decomposition products. The film thickness and surface relief are dependent on the strength of the magnetic field. We suggest, that a part of gaseous fragments, released from the PTFE during thermal degradation, attach...

Fluoropolymers (FP) are materials with a combination of excellent physical and chemical properties which make them useful in various industries. Thin films of these almost insoluble polymers were deposited with decomposition-evaporation of bulk FP in a vacuum. The pretreatment of the evaporated FP, the pressure of the emitted gas, the activation wi...

VOx films deposited using the multistep method have been investigated. These films were deposited by repeating the two-stage method of low-temperature deposition – low-temperature annealing. The structure and characteristics of VOx thin films have been studied. Taking into account the obtained results, theoretical modeling of the structure was perf...

The effect of surface plasmon-polaritons (SPPs) excited at the interface between the profiled surface of the silver layer (in the form of a diffraction grating) and the As4Ge30S66 layer on the photostimulated diffusion of silver into chalcogenide has been studied. The gratings with the period a = 519 nm and modulation depth h/a ≈ 0.037 (where h is...

In this work morphological, X-ray structural and optical studies of CdZnTe films grown by hot wall epitaxy method at relatively low substrate temperatures were performed. Possible mechanisms and processes of self-organization that occur during the growth of such structures are considered. It is shown that at thickness of film more than 130 nm on th...

The results of studies of printed ZnO:Co polycrystalline layers are first described. The layers with Co concentration of 0.78, 2.09 and 5.42 at.% were printed by a new stencil-free method developed by the authors and then were recrystallized at a temperature 1000–1100 °C. It was shown that the layers were polycrystalline with a typical grain size a...

For the first time, shear-induced metallization on the (001) face of diamond single crystals of types Ib, IIa and IIb during hardness tests is studied. The tests are performed using the Vickers and Berkovich indenters on diamond single crystals grown by the temperature gradient method. In the Raman spectra of imprints obtained on the (001) face of...

Fluoropolymers (FP) are materials with a combination of excellent physical and chemical properties which make them useful in various industries. Thin films of these almost insoluble polymers were deposited with decomposition-evaporation of bulk FP in a vacuum. The pretreatment of the evaporated FP, the pressure of the emitted gas, the activation wi...

Semiconducting boron-doped diamond single crystals of cubo-octahedral habit with prevalent development of octahedron {111} faces and insignificant area of cube {001}, rhombo-dodecahedron {110} and tetragon-trioctahedron {311} faces were obtained using solution-melt crystallization at high pressure 6.5 GPa and temperatures 1380…1420 °C. Using the Fe...

Using laterally ordered arrays of noble metal nanocavities as SERS substrates has been examined theoretically and experimentally. Simulation of the distribution of the electric field at the surface of nanostructures (nanocavities) has been carried out. The simulation results showed that cavities can be formed not only in a metal layer but in semico...

Dichroic organic films have found a broad application in various optoelectronic devices. One efficient method for the production of thin dichroic films is the deposition of the film onto aligning polymer surface. Scientists propose different explanations concerning the mechanisms of the molecules aligning. Here, we report the aligning of squaraine...

Polytetrafluoroethylene (PTFE), polyhexafluoropropylene (PHFP) and polychlorotrifluoroethylene (PCTFE) were heated to their decomposition temperature in a high vacuum. The emitted fragments passed an electron cloud, condensed on a substrate and formed fluoropolymer film. Growth rate of PTFE and PHFP films increased up to a factor five in presence o...

An experimental study of the excitation of surface plasmonpolaritons (SPP) on aluminum diffraction gratings with a fixed period of 519 ± 0,5 nm and a variable modulation depth h/a(where h is the grating depth, and a – its period) was carried out. Gratings with a sine-like profile were formed on vacuum chalcogenide photoresists films by interfere...

Polytetrafluoroethylene (PTFE), polyhexafluoropropylene (PHFP) and polychlorotrifluoroethylene (PCTFE) were heated to their decomposition temperature in a high vacuum. The emitted fragments passed an electron cloud, condensed on a substrate and formed fluoropolymer film. Growth rate of PTFE and PHFP films increased up to a factor five in the presen...

A nondestructive approach is described that is applicable for studying the In-segregation phenomena in ultra-thin In(Ga)As/GaAs nanostructures grown by molecular beam epitaxy. The proposed method utilizes only the experimental photoluminescence (PL) spectroscopy data and the effective bandgap simulation of specially designed ultra-thin In(Ga)As/GaA...

The effect of the surface plasmon polariton excitation at the silver–chalcogenide glass interface on the photostimulated diffusion of silver into chalcogenide was studied. The test sample was a two-layer Ag–As2S3 structure deposited on the diffraction gratings with a 899-nm period made using interference photolithography. Photostimulated changes we...

The effects of growth rate on the structural, morphological, and electrical properties of InN nanostructures grown on [0001]-oriented GaN substrates by plasma-assisted molecular beam epitaxy is reported. Slowing the growth rate of the nanostructures resulted in extended time for reaching thermodynamically favored crystal facet structures, while at...

Two types of ions (fluorine and titanium) are implanted into the film of regio-regular poly(3-hexylthiophene-2,5-diyl) (rr-P3HT) spin-coated on a glass substrate with subsequent annealing in argon atmosphere to modify their electrical properties and structure. The ion energy and fluence were within 0.2–40 keV and 10¹³–10¹⁵ cm⁻² respectively. The dc...

The monograph highlights the results of the scientific topic "Theoretical and practical aspects of the use of mathematical methods and information technology in education and science" (registration number 0116U004625) by the Department of Computer Science and Mathematics, Faculty of Information Technology and Management, Borys Hrinchenko University...

The chemical and structural modification of thin nanoporous graphitized carbon film was achieved by RF plasma treatment in the atmosphere of Ar, N2 and H2+N2. The effect of carbon surface modification on the resistive sensitivity of gas sensor to water and ammonia vapors is studied. It was shown, that nitrogen and forming gas plasma treatments resu...

We report the results of a study that was conducted to investigate the recombination paths of photoexcited charge carriers in GeSn thin films. The charge carrier lifetime was predicted as a function of temperature from a description of photoconductivity transients, assuming co-influence of Shockley-Read-Hall and radiative carrier recombination path...

The effect of collective trampoline ion-plasma sputtering on the surface properties of metals, insulators, and semiconductors is studied. The structure of the surface, composition and structure of films obtained by trampoline sputtering of various targets (metals, ceramics, silicon and carbon) are studied. The main parameters of the texturing proce...

Interaction of AsxSe100-x glass thin films with electron beam was investigated by Atomic force microscopy (AFM), Kelvin force microscopy (KFM), X-ray absorption fine-structure (EXAFS) and X-ray-absorption near-edge (XANES). Electron beam induces different surface reliefs depending on the irradiation dose. At doses equal to 7.4*10² μC/cm² Gausian-li...

The aligning polytetrafluoroethylene (PTFE) layer can be produced by hot friction transfer (FT) of bulk PTFE. The method, which allows to produce aligning PTFE layer at room temperature of substrate, consists of the two stages: 1-heating of the bulk PTFE in vacuum with activation of the emitted gas with cloud of electrons (EVD); 2-consequent unidir...

In spite of the fact that there are different techniques in the creation of the high-quality liquid crystals (LCs) alignment by means of various surfaces, the azimuthal and polar anchoring energies as well as the pre-tilt angle are important parameters to all of them. Here, the modified by a certain manner aligning layers, previously formed by nonl...

New method (magnetron plasma enhanced CVD) is suggested to obtain record values of porosity of thin carbon films. Further high temperature annealing results in graphitization of the carbon film and reduction of their resistivity down to 10 ² Ohm×cm. Plasma treatment in forming gas leads to modification both of a surface and bulk thin nanoporous gra...

Carbon nanoporous thin films are very attractive for application in fields of supercapacitors, fuel cells, gas sensors and others. However due to it very high resistance an employment of this material for resistance gas sensor is problematic. At the same time graphene based materials are very sensitive to different gas ambient and have a resistivit...

In spite of the fact that there are different techniques in the creation of the high-quality liquid crystals (LCs) alignment by means of various surfaces, the azimuthal and polar anchoring energies as well as the pre-tilt angle are important parameters to all of them. Here, the modified by a certain manner aligning layers, previously formed by nonl...

Rare earth metals, when deposited and oxidized on semiconductor surfaces, can be an alternative to unstable compounds of alkali metals while creating stable and effective emitters with a low work function. A procedure giving rise to the adsorption of Gd and O atoms on the Si(100) surface and the formation of a Si–Gd–O film with a work function of a...

The effect of the excitation of surface plasmon polaritons at the silver–chalcogenide glass interface upon the photostimulated diffusion of silver into chalcogenide was studied for the first time. A high-frequency aluminum diffraction grating with a period of 248.5 nm and a deposited two-layer Ag–As2S3 structure was used to excite plasmons. The pro...