Thermoelastic and Electronic Deformation Components of Photoacoustic Signal in Two-layer System

Abstract

A model was derived in order to study the dependence of the photoacoustic signal on the thermal, elastic and carrier transport properties of two-layer samples. The various systems were considered: the conductor-semiconductor, the insulator-semiconductor and the semiconductor-semiconductor system. The semiconductor-semiconductor system is possible to take in consideration as a general configuration, where the other two are the special classes. In the following theoretical analysis, thermodiffusion, thermoelastic and electronic deformation contributions have been used in order to interpret the photoacoustic effect in a two-layer system.