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Réalisation et caractérisation optique de microcavités en régime de couplage fort mettant à profit la structure en multi-puits quantiques auto-organisés des pérovskites en couches minces

Abstract : The research work which is reported in this manuscript focuses on 2D perovskites and their use to obtain microcavities working in the strong coupling regime. Perovskite structure forms a multi-quantum wells in which the excitonic states have a high oscillator strength and a large binding energy (a few 100 meV) due to quantum and dielectric confinement effects. A first axis of this work was to collect information on the excitonic properties of these materials. On a particular perovskite (PEPI), we performed photoluminescence and pump-probe measurements, which seem to suggest the existence, under high excitation density, a process of Auger recombination of excitons. A second research axis was to put in cavity thin layers of some perovskites. With PEPI and PEPC perovskites, we have shown that the realization of microcavities with a quality factor of the order of ten is sufficient to obtain at room temperature, the strong coupling regime in absorption and emission with Rabi splitting up to 220 meV. A bottleneck effect has been clearly demonstrated for the PEPI microcavity. We have also shown that perovskites could be associated with inorganic semiconductors in “hybrid” microcavities. According Agranovich et al., these microcavities could present polariton lasing with lower quality factors. To this end, the ZnO/MFMPB association seems particularly promising.
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Gaëtan Lanty. Réalisation et caractérisation optique de microcavités en régime de couplage fort mettant à profit la structure en multi-puits quantiques auto-organisés des pérovskites en couches minces. Autre. École normale supérieure de Cachan - ENS Cachan, 2011. Français. ⟨NNT : 2011DENS0046⟩. ⟨tel-00668474⟩

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