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NEWS

HDR : Louis BIADALA – Propriétés optiques, magnéto-optiques et électroniques des nanoplaquettes colloïdales (NPL) semiconductrice CdSe.

Louis BIADALA

Soutenance : 5 Octobre 2023 à 14h00
Amphithéâtre de l’IRCICA

Jury :
  • Xavier Marie(INSA Toulouse), rapporteur
    Maria Chamarro (INSP, Paris), rapporteur
    Efrat Lifshitz (Technion, Haïfa), rapporteur
    Benjamin Abecassis (ENS Lyon), examinateur
    Thierry Melin, examinateur
    Bruno Grandidier, garant
Summary:

Ce travail reflète les résultats que j’ai obtenus au cours de la dernière décennie sur les propriétés optiques, magnéto-optiques et électroniques des nanoplaquettes colloïdales (NPL) semiconductrice CdSe. En particulier, je décrirai l’origine des propriétés optiques des NPL de CdSe à température cryogénique. Une attention particulière sera accordée à la structure fine excitonique dans les NPL de CdSe et à la nature des différents pics dans les spectres de photoluminescence, ainsi qu’au rôle joué par les spins de liaison pendantes de surface sur les propriétés de polarisation. Je montrerai ensuite que les propriétés structurelles remarquables des NPL constituent un terrain de jeu idéal pour étudier en profondeur le concept de dimensionnalité électronique, i.e le degré de liberté de mouvement des électrons, dans les nanostructures. Enfin, je présenterai mes perspectives de recherche sur les nanostructures colloïdales, qui comprennent l’étude d’hétérostructures planaires telles que CdSe/CdS ou CdSe/CdTe, ainsi que des matériaux colloïdaux 2D de dichalcogénure de métal de transition (TMDC) tels que WS2 et les hétérostructures associées.

Abstract:

This work reflects the results I have obtained over the last decade on the optical, magneto-optical and electronic properties of CdSe semiconducting colloidal nanoplatelets (NPLs). In particular, I will describe the origin of the optical properties of CdSe NPLs at cryogenic temperature. Particular attention will be paid to the excitonic fine structure in CdSe NPLs and the nature of the different peaks in the photoluminescence spectra, as well as the role played by surface dangling bond spins on the polarization properties. I will then show that the remarkable structural properties of NPLs provide an ideal playground for an in-depth study of the concept of electronic dimensionality, i.e. the degree of freedom of electron motion, in nanostructures. Finally, I will present my research perspectives on colloidal nanostructures, which include the study of planar heterostructures such as CdSe/CdS or CdSe/CdTe, as well as 2D transition metal dichalcogenide (TMDC) colloidal materials such as WS2 and associated heterostructures.

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