Determination of the Optical Absorption Coefficient Spectra of Thin Semiconductor Layers from Their Photoacoustic Spectra

Abstract

This paper presents the new method of computation of the optical absorption coefficient spectra from the normalized photoacoustic amplitude spectra of thin semiconductor samples deposited on the optically transparent and thermally thick substrates. The simple equation for computations of the optical absorption coefficient spectrum from the normalized photoacoustic amplitude spectrum is derived and discussed. This model applied for computations of the optical absorption coefficient spectrum of thin germanium samples, deposited on the transparent glass substrate, from their photoacoustic spectra proved its correctness and usefulness.

Optical and Recombination Parameters of CdS1−xTex Thin Films Obtained by the CMBD Method

“…From the experimental amplitude PA spectral characteristics, the optical absorption coefficient spectra β(hν) of the samples were computed. For this purpose, the following formulae were applied [25,26]:…”