Etude et réalisation d'une cellule robotique d'imagerie photothermique et son application dans la caractérisation de quelques semiconducteurs ternaires

Abstract

The main objective in this work is to study and implement an automated photothermal spectrometer. The first measurement technique that can be done with this apparatus is the photoacoustic spectroscopy. The second is that of the photodeflection. Wavelength scanning and data acquisition and logging are done automatically by a program written in LabVIEW. The transition from one analysis technique to another is done by modifying only a few devices. Thus, one can make the analysis by photothermal beam deflection spectroscopy simply by adding a laser source and the position sensor detector that goes with it. To make photothermal imaging analysis, it is sufficient to add a motorized X-Y stage and a suitable focusing optics. The assembly conceived and implemented within the framework of this thesis will constitute an essential tool of analysis and characterization of the ternary and quaternary absorbing materials grown within our laboratory.