Published: 31 December 2009

Defect diagnostics in devices via acoustic emission

A. Bogorosh1
S. Voronov2
V. Roizman3
A. Bubulis4
Ž. Vyšniauskiene5
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Abstract

The research was conducted to explore conditions triggering degradation and deterioration processes in heterostructures using methods of acoustic emission. Current, flowing through materials, causes significant temperature gradients and thermo-mechanical stress (up to 107 Pa) that contributes to the development of undesirable microplasticity of the material. The research disclosed peculiarities of acoustic emission in n+-n-p- and p+-p-n- structures of A3B5 compounds under direct current in a process of their natural deterioration, and interdependence between the acoustic emission and developments in their electrical characteristics. The research facilitates direct and timely detection of defects and microcracks in different devices operating under threshold parameters and being influenced by external physical/mechanical forces generated from direct current and ultrasonic fluctuations

About this article

Received
20 October 2009
Accepted
27 November 2009
Published
31 December 2009
Keywords
Heterostructures
defect formation
acoustic emission
current
ultrasound
deterioration