Generalized Muller-Kern formula for equilibrium thickness of a wetting layer with respect to the dependence of the surface energy of island facets on the thickness of the 2D layer

Experimental results indicate a particular importance of such a value as the equilibrium thickness of the wetting layer during epitaxial growth according to the Stranski–Krastanow mechanism in systems with a lattice mismatch. In this paper the change in free energy during the transition of atoms from the wetting layer to the island in such systems is considered. Recent experimental results also show that the surface energy of the island's facets depends upon the thickness of the deposited material. So, in this paper the equilibrium thickness of the wetting layer, at which transition from 2D to 3D growth becomes energetically favorable, is calculated with the assumption that the specific energy of the island's facets depends upon the wetting layer thickness. In this approximation a new generalized Muller–Kern formula is obtained. As an illustration of the proposed method, an example of a numerical calculation according to the new formula for the material system of germanium on a silicon (001) surface is given. The result for the found equilibrium thickness of the wetting layer is rather unexpected since it differs from the value obtained in the bounds of the traditional Muller–Kern model

Kinetics of epitaxial formation of nanostructures by Frank-van der Merwe, Volmer-Weber and Stranski-Krastanow growth modes

Nowadays, two-dimensional crystals (2D materials) and structures with quantum dots (0D materials) are considere

Changes in the electro-physical properties of MCT epitaxial films affected by a plasma volume discharge induced by an avalanche beam in atmospheric-pressure air

In this paper the influence of the plasma volume discharge of nanosecond duration formed in a non-uniform electric field at atmospheric pressure on samples of epitaxial films HgCdTe (MCT) films are discussed. The experimental data show that the action of pulses of nanosecond volume discharge in air at atmospheric pressure leads to changes in the electrophysical properties of MCT epitaxial films due to formation of a near-surface high- conductivity layer of the n-type conduction. The preliminary results show that it is possible to use such actions in the development of technologies for the controlled change of the properties of MCT

Analysis of the 7x7 to 5x5 superstructure transition by RHEED in the synthesis of Ge on Si (111) in an MBE installation

In this paper, we consider the 7x7 to 5x5 superstructure transition during the synthesis of Ge epitaxial layers on a Si (111) surface in its temperature range from 250 to 700 °C. This transition is investigated by reflection high-energy electron diffraction (RHEED). As a result, the dependences of the critical thickness of the 7x7 to 5x5 superstructure transition on the substrate temperature are obtained for the first time

Parental alexithymia as a risk factor for teens alcohol use

The purpose of the randomized, cross-sectional and correlational study was to investigate the presence, strength and nature of the relationship of parental alexithymia with alcohol use by their children. The study used the sociological and psycho-diagnostic methods. The results of correlation studies have shown strong and highly significant positive relationships of teens alcohol use both with parental alexithymia and with the alexithymic construct factorial components. Parental alexithymia, as well as sensual, communicative and cognitive alexithymic construct components are risk factors of teens alcohol use.Целью рандомизированного, кросс-секционного и корреляционного исследования являлось изучение наличия, силы и, характера связи алекситимии родителей с употреблением алкоголя их детьми. Исследование проведено с использованием социологических и психодиагностических методов. Результаты корреляционного анализа показали сильные и высоко значимые позитивные связи употребления алкоголя подростками с алекситимией родителей, а также с факторными составляющими алекситимического конструкта. Алекситимия родителей, а также чувственный, коммуникативный и когнитивный компоненты алекситимического конструкта представляют собой значимые факторы риска раннего употребления алкоголя детьми