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The chloride-hydride epitaxy is the main gas-phase method for producing the layers for the functional Homo- and heterostructures in micro- and optoelectronics. Nowadays, for producing nanoheterostructures a significant progress in MOS-hydride and molecular beam epitaxy has been made. The method of molecular layering is developing. The emergence of new materials requires the long-term development of optimal technological conditions for their production and therefore it is necessary to create the mathematical, physical and other principles of modeling these processes. The chloride-hydride method continues to be improved for producing relatively thick layers of functional heterostructures. The bases of physical-chemical modeling on an example of chloride-hydride epitaxy have been proposed. In accordance with the concepts of classical thermodynamics as a measure of the system stability is the free energy. For the process of the stationary epitaxial growth the crystallization energy, which for the case of two-dimensional embryo formation is expressed by the Gibbs-Thompson equation, will be this measure. A physical-chemical model of changing the technological modes of gas-phase epitaxy of various compounds under appropriate conditions, under which the compounds with the same degree of disordering are obtained, has been considered. The equations, which permit to use the conditions of already well-developed technology of any material to forecast the conditions of other materials epitaxy of the same type group, have been derived. The obtained regularities are being used to optimize the chloride-hydride process of gallium phosphide epitaxy and solid state solutions based on it. The conditions of the gallium nitride epitaxy coincide well with the conditions of real technological developments of other authors.
Evgeny N. Vigdorovich
MIREA – Russian Technological University, Moscow, Russia

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