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Synthèse et caractérisation d'homostructures et d'hétérostructures de nanoplaquettes de chalcogénures de mercure

Abstract : In a context of detectors and lasers develop-ment in infrared range, mercury chalcogenides colloidal nanocrystals are promising candi-dates for low-cost IR imaging. For 10 years, cadmium chalcogenides semiconductors na-noplatelets are developed. These two-dimensional nanoparticles present great novel optical features in visible range, due to exciton confinement along one direction. The purpose of this thesis is to synthesize mercury chalco-genides-based nanoplatelets in order to obtain nanoparticles with narrow infrared optical fea-tures. To this end, we used cation exchange with mercury on cadmium chalcogenides na-noplatelets, because of the direct synthesis isn’t demonstrated yet.In a first part, this manuscript presents the syn-thesis and the characterization of 2 and 3 monolayers HgTe and HgSe nanoplatelets. HgTe nanoplatelets present exceptionally nar-row near-infrared optical features (57 meV for an emission around 890 nm).The impact of the thickness of CdSe nano-platelets on the cation exchange process was subsequently studied. The limited diffusion of mercury atoms over 2 cationic plans in the thickness direction allows to obtain CdSe/HgSe core/shell heterostructures. The optical and transport properties are decorrelated.Finally, this cation exchange was used to formed new mercury-based heterostructures: HgTe/CdS core/shell and HgSe/HgTe core/crown. These materials present new opti-cal properties in infrared range thanks to the electron and hole confinement in a same or different part of the heterostructure.
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  • HAL Id : tel-02506648, version 1

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Eva Izquierdo. Synthèse et caractérisation d'homostructures et d'hétérostructures de nanoplaquettes de chalcogénures de mercure. Matériaux. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLET028⟩. ⟨tel-02506648⟩

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