Basic models of isothermal depolarization analysis for diagnostics of heterogeneous materials

Abstract

Purpose

The purpose of this paper is to explore and develop specific models of the kinetics of isothermal depolarization currents (IDC) and the corresponding methods for the diagnostics of the physical parameters of localized electronic states (LES) in heterogeneous materials and corresponding polycrystalline semiconductor materials and heterogeneous insulators with a conductive phase.

Design/methodology/approach

Analysis of the kinetics of isothermal depolarization on the basis of the models allowed the authors to establish a sufficient level of their information content. This also allowed the possibility of applying for research and testing of heterogeneous structures of electronic technique.

Findings

Optimal conditions (full charge of LES on one side of the object and full discharge on the other side) and the correction factors, allowed the researchers to find concentration of these states using the developed models.

Originality/value

This paper uses a particular method to determine and test the parameters of LES, including operations of determining the time constant of IDC signal from its frequency spectrum, finding the ionization energy and the capture coefficient of electrons from the temperature dependence of this time constant, determining the concentration based on the integration of the time dependence of current density of IDC in the time interval that boundaries are determined from the limited range of frequencies of the signal IDC spectrum has been proposed, validated and verified by numerical experiments.

Citation

Khandetskyi, V.S. and Tonkoshkur, Y.A. (2012), "Basic models of isothermal depolarization analysis for diagnostics of heterogeneous materials", Multidiscipline Modeling in Materials and Structures, Vol. 8 No. 1, pp. 105-119. https://doi.org/10.1108/15736101211236001