Василий Трофимов

• MS
• Research Assistant at St Petersburg University

This study assesses promising field electron sources based on silicon carbide monolithic field emission array (FEA). FEA is fabricated on single-crystal wafers of silicon carbide (0001C) 6H-SiC of n-type conductivity using the technology of two-stage reactive ion etching in SF6/O2/Ar atmosphere. To implement conditions close to breakdown, an experi...

This study assesses promising field electron sources based on silicon carbide monolithic field emission array (FEA). FEA is fabricated on single-crystal wafers of silicon carbide (0001C) 6H-SiC of n-type conductivity using the technology of two-stage reactive ion etching in SF 6 /O 2 /Ar atmosphere. To implement conditions close to breakdown, an ex...

In-line holography (holography of Gabor) is a simple and effective method of holographic investigation of the structure of objects. The computer simulation of holographic images is based on the numerical solution of Fresnel integrals with fast Fourier transform algorithms. We propose a new method for the numerical reconstruction of holographic imag...

Within the framework of this work, the numerical results of simulation and reconstruction of holographic images with different physical sizes of the object and observation areas are presented. Simple and practical approaches to relatively flexibility choice of physical areas (e. g., units of m2) in both planes are proposed. Algorithms are presented...

We present the most common methods for the lensless visualization of individual molecules with an atomic resolution. The visualization is understood as a formation of an image by the lensless method and its subsequent numerical reconstruction. The basic principles of a formation of images of objects of study by the lensless method are presented. Di...

The research of thin films of various materials on nano- and microlevel is undoubtedly topical. Three-dimensional images of thin films can significantly increase the level of the received results. Intellectual computer support of researches assumes the existence or creation of mathematical and the software that implements the experimental program....

The parameters of a kendroscope associated with the necessary position of the electron source and the object of research are optimized. The selection of thin layers of some metals suitable for visual observation of their structure and initial film growth is carried out.

The comprehensive study of the low threshold electron emission from multi-layered graphene-like structures (GLS) has been undertaken. The spectrum of emitted electrons from GLS has been obtained by retarding potential method. The state of the surface has been evaluated using scanning electron microscopy (SEM) and field emission microscopy (FEM). Th...

Experimental set up for the natural experiment and measurement model are presented to obtain the feld emission energy distribution spectrum out of silicon carbide in case of the macro-sample having a macroscopic shape of a tip. The prototype of feld emission 6H - SiC monolithic cathode is proposed for spectroscopy measurements, and characterised by...

It is demonstrated that the field emission from graphene-like structures (GLSs) has a very low excitation threshold (about two orders of magnitude lower than that of metals and semiconductors). It is shown that the total energy distribution (TED) of field emission electrons from GLSs differs considerably from the spectra obtained for metals. The ex...

Systems of monolayer films of graphene, porthyrin, copper and zinc phthalocyanine are investigated. For all systems equilibrium geometries are found, all structures are flat, except for a chlorine-replaced copper phthalocyanine. DFT modeling of the structure of thin films is performed as substantially promotion in interpretation of the results rece...

This article discusses the problem of measurement of Field Emission Energy Distribution (FEED) from silicon carbide by the retarding potential method. A description of an natural experiment setting is presented as well as a model of its electrophysical system of field emission current differentiation by modulated retarding potential. It discusses p...

In this work, the main parameters of a holographic microscope are studied with the aim of optimizing them. The optimum positions for the monochromatic electron-beam source with respect to the subject of research and for the screen detecting the interference pattern (the distance is 100 nm and 10 cm, respectively) are determined. The limiting thickn...

A non-gated NbN on Si wafer field emission arrays are studied. The I-V measurements and emission characteristics of edge-shaped cathodes in atmosphere low-voltage regime are considered. Mathematical and computer models are presented. The current density obtained from experiment was up to 384 Ampere per square centimeter in emission area 9 mm2. Low-...

A holographic microscope is intended for investigation and visual observation of nanoobjects that are thin metal films or macromolecules. A module providing for the experimental research of such objects has been designed and built. The optimal thickness of the metal films has been estimated. Software for processing the interference patterns with th...