Dmitry Kovalenko

Francisk Skorina Gomel State University · Physics and Information Technology

The purpose of this work is to build the analytical model of the behavior of a harmonic wave in a nonlinear optical medium with periodically arranged nanofilms. Methods. The modernized method is presented of non-smooth transformation of the argument to eliminate the Dirac functions on the right side of the non-linear inhomogeneous differential equa...

In this work, we have investigated the photocurrent and spectral sensitivity of the silicon/SrTiO3:xNb/perovskite structures. The sol–gel method carried out the deposition of undoped SrTiO3 layers as well as niobium-doped (SrTiO3:Nb) layers at atomic concentrations of 3 and 6% Nb. The perovskite layer, CH3NH3PbI3−xClx, has been deposited by the vac...

The technological possibility of using black silicon (b-Si) in tandem silicon-perovskite solar cells as an antireflection surface is analyzed. The structural and optical properties of samples consisting of a silicon substrate with a b-Si surface, an electron transport layer of titanium dioxide, and a photoactive layer of an organometallic halide pe...

The present work presents the results of the investigation of multiferroic materials (BiFeO3 and Bi1-xSmXFeO3) with perovskite structure, which possesses two types of orderings: ferromagnetic and ferroelectric. Also, the obtained samples were investigated by Raman spectroscopy to provide detailed information about chemical structure, phase purity a...

The paper describes the sol-gel method for obtained TiO2 nanotubes on a sublayer of ZnO nanorods pre-formed by the hydrothermal method. Optimal regimes have been determined for the formation of TiO2-ZnO materials. The surface morphology of the obtained nanostructures has been carried out. Investigations of the surface morphology and structure of th...

The structural and photoelectric characteristics of thin ZnO, TiO2, and SiO2 sol-gel films on the black silicon (b-Si) surface have been studied. The cross-section and top-view morphology of the b-Si and thin films was observed by a scanning electron microscope and atomic force microscope. Measurement of photoelectric characteristics (current-volta...

The paper presents sol-gel and Ni thermal oxidation methods for producing thin NiO films. The high transparency of the films correlates with their low electrical conductivity. In the oxidation method small additions of Al (in our work up to 5%) can significantly increase the conductivity of the films, while the transparency of the films is determin...

The paper describes the study of methods for converting precursors into optically transparent aluminum oxide and identifies the most promising methods for the synthesis of sapphire glasses. KeywordsSol-gel processSapphire-like glassTransparent aluminium oxide ceramicAluminum-tri-sec-butoxide

The paper describes the sol-gel method for producing photocatalytic materials based on titanium oxide. The temperature-time regimes of heat treatment of the obtained materials are determined. The surface properties of the resulting coatings were studied by scanning electron microscopy and asthmatic force microscopy. The photocatalytic properties of...

The present work aims to design and study novel functional materials with multiferroic properties required in electric applications, such as magnetic and magnetoresistive sensors, actuators, microwave electronic devices, phase shifters, mechanical actuators etc. Complex oxides BiFeO3 and Bi0,9La0,1FeO3 for analysis of its structural properties were...

The present work aims to design and study novel functional materials with multiferroic properties required in electric applications, such as magnetic and magnetoresistive sensors, actuators, microwave electronic devices, phase shifters, mechanical actuators etc. Complex oxides BiFeO 3 for analysis of its magnetic properties were synthesized by sol-...