Voronezh State University

About: Voronezh State University is a education organization based out in Voronezh, Russia. It is known for research contribution in the topics: Silicon & Boundary value problem. The organization has 5166 authors who have published 6097 publications receiving 31680 citations. The organization is also known as: VSU & Voronezh University.

Silicon nanocrystals in SiO2 matrix obtained by ion implantation under cyclic dose accumulation

Abstract: Silicon ions were implanted into the films of silicon oxide obtained by thermal oxidation of silicon wafers in a damp oxygen. Accumulation of the implantation dose was performed either in one step or cyclically in step-by-step mode, and after each stage of implantation the samples were annealed in a dry nitrogen. The second series of the samples differed from the first one by the formation of SiO 2 matrix that included additional annealing in the air at 1100 °C for 3 h before ion implantation. X-ray absorption near edge structure (XANES) was obtained with the use of synchrotron radiation. Two absorption edges were observed in all of Si L 2 , 3 -spectra. One of them is related to elementary silicon while the other one-to silicon in SiO 2 . The fine structure of the first one indicates the formation of nanocrystalline silicon nc-Si in SiO 2 matrix. Its atomic and electron structure depends on the technology of formation. For both series of samples, a cyclical accumulation of the total dose Φ = 10 17 cm- 2 (for the total time of annealing-2h) resulted in the appearance of more distinct structure in the range of absorption edge for the elementary silicon as compared with the case of single-step accumulation dose. In the more "dense" oxide of the samples from the second series, the probability of formation of silicon nanocrystals in a thin near-surface region of the implanted layer was reduced. These results can be interpreted with the account of the previously obtained photoluminescence, Raman scattering and electron microscopy data for these samples.

Development and Research of a "Smart Home" Heating Control System

Abstract: The analysis and modeling of the control system as an automation object. A heating unit based on the Arduino controller was developed and implemented. The results of controlling the heating unit are presented. The possibility of connecting a smartphone for the purpose of management and control is evaluated.