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Synthèses et caractérisations de nanoparticules de semiconducteurs II-VI de géométries contrôlées

Abstract : We have determined the local pressure in CdS/ZnS nanocrystals, thanks to the manganese phosphorescence signal. A few dopant atoms per nanoparticle were placed at controlled radial positions in a ZnS shell formed layer by layer. The experimental pressure measurements are in good agreement with a simple spherically symmetric elastic continuum model. Using spherically symmetric elastic continuum model could be used to better understand some structural phenomena observed in these nanocrystals, such as changes in crystalline phases, or cracking of some shells and could be used to design better core/shell nanoparticles. In a second step, we developed the colloidal synthesis of CdSe, CdS and CdTe quantum wells. The thicknesses of these nanoparticles are tuned at the atomic level and they present some new physical properties. We cite, in particular, their emission with a full width half maximum of the order of kT at room temperature. Finally, we show that it is possible to laterally extend these nanoparticles and we used the k.p model applied to quantum wells to determine the real values of nanoplatelets thicknesses and to verify the physical parameters for the three materials.
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Submitted on : Monday, November 22, 2010 - 6:20:16 PM
Last modification on : Wednesday, October 14, 2020 - 3:43:14 AM
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  • HAL Id : pastel-00538570, version 1

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Sandrine Ithurria Lhuillier. Synthèses et caractérisations de nanoparticules de semiconducteurs II-VI de géométries contrôlées. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨pastel-00538570⟩

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