A5072729043- Semiconductor materials and interfaces
- Semiconductor Quantum Structures and Devices
- Silicon Nanostructures and Photoluminescence
- Surface Roughness and Optical Measurements
- Nanowire Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Image and Signal Denoising Methods
- Conducting polymers and applications
- Optical Coatings and Gratings
- Photonic and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Organic Electronics and Photovoltaics
- Mechanical and Optical Resonators
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Photonic Crystals and Applications
- Semiconductor materials and devices
- Digital Filter Design and Implementation
- Copper-based nanomaterials and applications
- Quantum Dots Synthesis And Properties
- Statistical and numerical algorithms
- Boron and Carbon Nanomaterials Research
- Laser-Ablation Synthesis of Nanoparticles
- nanoparticles nucleation surface interactions
National Academy of Sciences of Ukraine
2007-2024
V.E. Lashkaryov Institute of Semiconductor Physics
2007-2024
National Academy of Sciences
2006
Optical properties of ZnO films doped by Al in the range 0.5 to 7 at.%and deposited atomic layer deposition were studied visible and infrared spectral range.Spectral dependences film optical permittivity modeled with Lorentz-Drude approximation resulting ZnO:Al plasma frequency damping parameters.We observed changing electron effective mass from 0.29m0 0.5m0 increasing concentration (0.9-4) × 10 20 due phenomenon conduction band non-parabolicity.Comparing results electrical investigations we...
Comparison between solar cell heterostructures based on poly(3,4-ethylenedioxythiophene)-poly(styrene-sulfonate) (PEDOT:PSS) organic complex thin film and semiconductors (Si, GaAs) with flat microrelief interfaces have been performed. PEDOT:PSS thicknesses optical parameters were ascertained using spectroscopic ellipsometry, while electrical dc-conductivity was determined the four-point probe method. A method of increasing conductivity films by forming a multilayer decreased content PSS...
Solar cell heterostructures based on PEDOT:PSS/Si heterojunction with a flat and microrelief interfaces of pyramidal inverted pyramids type, unmodified chemically doped PEDOT:PSS films have been fabricated. The maximum efficiency 6.14% was obtained for solar type interface film, which is five times higher than structure interface. It shown that an increase in the occurred both due to decrease optical losses from textured Si improvement electrical parameters polymer layer chemical doping DMSO.
Ge-rich ZrO2 films, fabricated by confocal RF magnetron sputtering of pure Ge and targets in Ar plasma, were studied multi-angle laser ellipsometry, Raman scattering, Auger electron spectroscopy, Fourier transform infrared X-ray diffraction for varied deposition conditions annealing treatments. It was found that as-deposited films are homogeneous all contents, thermal treatment stimulated a phase separation formation crystalline ZrO2. The “start point” this process is the range 640–700 °C...
The effect of vacuum heat treatment in the temperature range between 100 and 400 °C on morphology optical properties thermally evaporated thin gold films with mass thickness from 8 to 80 nm was studied by AFM, TEM spectroscopy spectral region localized (surface) plasmons excitation. Our investigations have shown that change film induced thermal annealing depends strongly thickness. Thus, behavior metal is modified due being recrystallization permittivity changes as well transformation...
The study is focused on formation and optical properties of nanostructures induced by laser radiation the surface Si1-xGe(x)/Si hetero-structures. Formation self-assembling nanohills irradiation nanosecond Nd:YAG pulses Si0.7Ge0.3/Si hetero-epitaxial structures reported. atomic force microscope irradiated morphology has shown a start after intensity I = 7.0 MW/cm2. huge "blue shift" photoluminescence spectra with maximum in region 700-800 nm (1.76-1.54 eV) explained quantum confinement...
In this work, two methods for fabrication of composite conductive films, consisting single walled carbon nanotubes (SWCNTs) and PEDOT:PSS, in order to obtain films with high conductivity transparency their use solar cell structures based on Si have been compared. The thickness optical parameters the were determined using spectro-ellipsometric measurements within spectral range 0.6…5.0 eV. electrophysical obtained from four-point probe measurements. Our results showed that method deposition...
Multiple repeated procedure of spin-coating, thermal annealing and midcycle washing the non-conductive PSS component was developed to fabricate multilayer PEDOT:PSS films. A 4–5 times enhancement relative single-layer film conductivity up 236 S/cm observed. An increase in results from formation a dense without voids excess insulating closer contact between conducting PEDOT globules. The optical properties films are described well visible–near-IR region by combining Cauchy Drude models for...
The electrical characteristics and deep-level transient spectroscopy of a hybrid poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/GeNCs/Si heterojunction with Ge nanoclusters grown by molecular beam epitaxy on p-type Si(001) substrate are investigated. heterostructure shows good rectifying J–V characteristics, the dark current exhibits an activation energies 280 meV 550 meV, while reverse bias leakage is suppressed due to coating PEDOT:PSS. We show that recombination via...
The peculiarities of optical and electrical properties organic(clonidine)/inorganic(Si) heterojunction with plasmonic Au nanoparticles have been investigated by reflection spectra, photoelectric current-voltage characteristics measurements. Porous nanostructured surfaces silicon wafers were obtained the method selective chemical etching initiated metal (gold) nanoparticles. Nanocomposites based on silicon, clonidine gold made. Two types structure, namely, solar cells photodiodes basis such...
This study examines the optical properties of thin Cu (Ag)-layered structures covered with protective layers based on graphene, titanium (TiO2), or aluminium (Al2O3) oxides. The objective is to investigate impact these coatings behaviors underlying metallic layers, specifically in spectral range excitation surface plasmon resonances. Combining methods spectroreflectometry and spectro-ellipsometry was used analyze characteristics hybrid metal-oxide-graphene films. shows that due its...
The influence of magnetic field on Ψ(λ) and Δ(λ) dependences Al-based plasmon-polariton photodetectors (PPPD) at different flux densities (100 300 mT) directions was investigated. It obtained that the action results in shift surface plasmon resonance peak (SPR) position a change its intensity. Particularly, configuration ( are collinear) noted effects were most pronounced. Additionally, it found magnetic-induced sensitive to angle incidence, particularly they enhance with decreasing...
The Ge and SiGe nanocrystalline films were grown on Si(001) surface by molecular-beam epitaxy. optical constants of thin determined multy-angle monochromatic ellipsometry. Optical properties such systems described using the Bruggeman's theory effective medium approximation. Deposition Si with nanoclusters changes due to porosity films.
The dependence of conductivity the composite PEDOT:PSS with embedded carbon nanotubes films on method its preparation was investigated. Especially, a layer-by-layer deposition and film from mixture (CNT) are compared. electrophysical parameters were obtained four-point probes measurements while optical spectroscopic ellipsometry. Our results showed that CNT allows one to obtain higher (≈170–180 S/cm) compared depositing their (≈62–92 S/cm).
The influence of irradiation by heavy ions 131Xe on optical and adsorption properties SiO2/Sі plates with tin dioxide (SnO2) particles embedded into nanopores was investigated. constants (n, k) the composite were determined multiangle monochromatic ellipsometry (λ = 632.8 nm) in atmospheric environment as well acetone vapor. It is shown that incorporation SnO2 porous silicon (SiO2) leads to a changes effective permittivity layer increases sensitivity active element sensor vapors acetone.
The paper analyzes the biocenotic distribution of Melyridae beetles in conditions Transcarpathian lowland. In total, 26 species this family belonging to two subfamilies and ten genera were found region. Most melirid are typical hortobionts, some thamnobionts. Considering fact that group Coleoptera is a part meadow forest insect communities, components them, can serve as indicators stability natural meadow-shrub ecosystems. That why study community composition their relevant context forming...