Propriétés de luminescence et caractérisation structurale de films minces d'oxydes de silicium dopés au cérium et codopés cérium-ytterbium

Abstract : This thesis concerns the structural characterization and the photoluminescence properties of thin silicon oxide films doped with rare earths The films are doped with cerium. The co-doping with both cerium and ytterbium is also studied in the case of SiO 2 layers. It is shown that in oxides with composition SiO1, cerium plays an important role in the structure and chemical organization of the oxide, in particular by promoting phase separation of the oxide. The exposure to a focused laser beam generates a local demixtion favored by cerium. For thin SiO1,5 films containing both cerium and silicon nanocrystals, we are able to follow the phase separation occuring between Si nanocrystals and Ce rich aggregates using both atom probe tomography and scanning transmission electron microscopy. The luminescence properties of dopants are discussed in connection with the microstructure of the host matrix. For all these systems, the formation of a cerium silicate with composition Ce2Si2O7 is observed at high temperature (> 1100 ° C). The cerium present either as isolated Ce3+ ions or in a silicate emits intensely at 400 nm (blue) at room temperature, which might be of interest for the development of blue light emitting diodes fully compatible with the Si technology. Finally, an energy transfer from Ce3+ ions to Yb3+ ions is demonstrated in thin SiO2 films opening the route to possible applications in the field of photovoltaics
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  • HAL Id : tel-01751104, version 1

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Jennifer Weimmerskirch-Aubatin. Propriétés de luminescence et caractérisation structurale de films minces d'oxydes de silicium dopés au cérium et codopés cérium-ytterbium. Autre [cond-mat.other]. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0180⟩. ⟨tel-01751104⟩

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