Thermoelastic and electronic deformation components of photoacoustic signal in two-layer system

A model was derived in order to study the dependence of the photoacoustic s ignal 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. Th e semiconductor-semiconductor system is possible to take in consideration a s a general configuration, where the other two are the special classes. In the following theoretical analysis, thermodiffusion, thermoelastic and elec tronic deformation contributions have been used in order to interpret the p hotoacoustic effect in a two-layer system.