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Spectroscopie des transitions excitoniques dans des puits quantiques GaN/AlGaN

Abstract : This work deals with the study of optical and electronic properties of GaN / AlGaN quantum wells, by classical techniques of spectroscopy including angle resolved reflectivity or photoluminescence, but also by time resolved photoluminescence. The continuous wave photoluminescence experiments allowed estimating the energies of the excitonic transitions, which are also available through reflectivity. These techniques highlighted the Stark effect in GaN / AlGaN quantum wells. The influence of the Stark effect on the energies of the excitonic transitions is well reproduced by envelop functions theory. Reflectivity spectra give access to the oscillator strength via their fitting by transfer matrix formalism, taking in account both homogeneous and inhomogeneous broadenings of the optical transitions. Finally, time resolved photoluminescence measurements as a function of temperature were performed to extract the oscillator strength, which is proportional to the inverse of the radiative recombination time. This technique also highlighted the Stark effect which is responsible of the vanishing of the oscillator strength with the thickness of the well and the aluminium composition. Increasing of the quantum well’s thickness induces decreasing of wave functions overlap, as well as an increasing of the aluminium composition which intensifies the electric field and splits the wave functions.
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Georges Rakotonanahary. Spectroscopie des transitions excitoniques dans des puits quantiques GaN/AlGaN. Autre [cond-mat.other]. Université Blaise Pascal - Clermont-Ferrand II, 2011. Français. ⟨NNT : 2011CLF22117⟩. ⟨tel-00662445⟩

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