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Cristallisation et fonctionnalisation de pérovskites hybrides halogénées à 2-dimensions pour le photovoltaïque et l’émission de lumière

Abstract : Hybrid halide perovskites are new class of high-end semiconductors that combine high performances, low cost and low temperature proccessability for different application such as photovoltaics or light-emitting devices. Their large-scale commercialization is however hindered by their poor stability. For a few years, many groups started to grow interest in 2-dimensional (2D) hybrid perovskites. This subclass of perovskite is much more stable than their 3D counterparts, and offers more chemical flexibility. Yet their performances are limited by the bad quality of the spin-coated layers. Moreover an increase in the understanding of their intrinsic properties is necessary. This last point could be solved by the study of single crystals. We developped therefore a new anti-solvant, vapor-assisted crystallization (AVC) method for the growth of (PEA)2PbI4 and (PEA)2(MA)Pb2I7. Furthermore, a capped AVC process (AVCC) was developped for the growth of 2D perovskites single crystalline thin films. These films might help getting closer to the intrinsic limits of the material. We also synthesized new 2D luminophore-functionalized perovskite systems. The spectroscopic studies of this material highlighted a possible charge transfer between the two moities of the perovskite. This kind of perovskite could help improving the photovoltaic performances of 2D perovskite thanks to the splitting of the strongly bounded exciton.
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Submitted on : Wednesday, December 19, 2018 - 3:24:09 PM
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Ferdinand Ledee. Cristallisation et fonctionnalisation de pérovskites hybrides halogénées à 2-dimensions pour le photovoltaïque et l’émission de lumière. Autre. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLN045⟩. ⟨tel-01960754⟩

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