Étude des propriétés optiques de nanoparticules de semiconducteurs : application de l'ellipsométrie aux silicium et germanium nanostructurés

Abstract : Silicon and germanium are the two semiconductors the most studied by the scientific world due to their interesting fundamental physical properties and their potential applications in nanotechnology. Indeed, the intense photoluminescence in the visible range observed on silicon and germanium of nanometric size open prospects for applications in advanced optoelectronic devices. In nano-electronic field, the capacity to store and restore charges is very promising in thin layers containing nanocrystals. However, physical mechanisms responsible of these new properties remain still under investigations. In this work, we report the study of the optical properties of silicon nc-Si and germanium nc-Ge nanocrystals embedded in silica matrix by a non-destructive optical technique Spectroscopic ellipsometry. The samples under investigations elaborated at the Institute of Electronics of the Solid and Systems (InESS), are obtained by ionic implantation and subsequent annealing. The aim of our study is to understand the optical behavior of nc-Si and nc-Ge through the determination of their complex dielectric functions in the UV-Visible range, the highest optical transitions (Van Hove Singularities) in the entire Brillouin zone and the optical band gap. We also studied the influence of the elaboration conditions and in particular the implantation temperature on the structural and optical properties of the nanocrystals. Physical models adapted to each sample were developed in order to extract the optical answer from these nanomaterials. The results are discussed in the framework of the theoretical models based on quantum confinement.
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Mohammed Mansour. Étude des propriétés optiques de nanoparticules de semiconducteurs : application de l'ellipsométrie aux silicium et germanium nanostructurés. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2006. Français. ⟨NNT : 2006METZ012S⟩. ⟨tel-01752457⟩

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