Modeling of electric mass transfer process in controlled electrochemical resistance

The aim of the study is to mathematically simulate the concentration field of an electrolyte in a controlled electrochemical resistance. All processes occurring in the object are considered isothermal, the electric fields in all fragments of the electrochemical resistance are potential, plane-parallel. All physical and chemical parameters of the object’s materials are constant values. The kinetics of all electrode processes in the object of study is controlled by the diffusion stage in the electrolyte. As a research method, the operator method of Laplace and Fourier – expansion is used to obtain an analytical description of the concentration field of the electrolyte. In the course of the study, a mathematical model of the concentration field of the electrolyte with a uniform distribution of the current density was obtained. An analytical expression is obtained that allows to construct the surface of the change in the concentration of the electrolyte in the controlled electrochemical resistance. The concentration profiles of the electrolyte at different temperatures and the time dependences of the change in the concentration of the electrolyte are calculated.

INVESTIGATION OF TECHNOLOGICAL PROCESSES FOR CREATING LOW-DIMENSIONAL CONDUCTORS BASED ON PROBE LITHOGRAPHY

Probe methods can not be considered a technology suitable for large-scale production of nanostructures due to low productivity and the difficulty of constructing three-dimensional structures. It is important, however, that they demonstrate the possibility of constructing complex nanostructures in the laboratory for research purposes. Experiments of this kind make it possible to study the physics of low-dimensional structures and to investigate the possibilities of their practical use in electronic devices. In this paper, we have investigated the technology of creating gold low-dimensional conductors on a dielectric substrate by methods of probe lithography. A literature analysis was conducted, during which was proposed a method for creating conductors based on the method of electric mass transfer. The contact pad of the 142EN1B microcircuit was used as a sample. To form a substrate with the required thickness of the gold film, the technology of chemical thinning (etching) of the surface of the finished sample was applied. A mixture of hydrochloric HCl and nitric acids HNO3 was chosen as a solution for etching gold. Within the framework of this work, the technique of preparing the substrate was developed, the parameters of STM lithography were investigated, and gold conductors were formed on the substrate. On the basis of the developed technology, nanoscale structures were obtained. Microscopic analysis showed that the minimum cross-section of the obtained gold conductors was 15…20 nm, the length was more than 50 nm.