Photoacoustic investigations of the quality of the surface preparation of Cd₁₋ₓBeₓTe samples

Abstract

In this work, the results of the photoacoustic frequency characteristics research of a series of Cd_1-xBe_xTe crystals, x = 0.01, 0.03, 0.1, after different surface treatments are presented. The samples showed thin surface layers resulting from a mechanical treatment, such as grinding and polishing their surfaces. The presented research aimed to investigate the possibility of determining the thickness of these surface layers resulting from their mechanical processing and to evaluate their thermal parameters with the frequency-domain photoacoustic (PA) method. It turned out that it is possible to simultaneously derive the thickness of the surface layer and its thermal parameters, such as thermal conductivity and thermal diffusivity, from fitting theoretical amplitude and phase PA characteristics to the experimental factors.