Negatively Charged Excitons in CdSe Nanoplatelets
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Negatively Charged Excitons in CdSe Nanoplatelets
Auteur(s) :
Shornikova, Elena [Auteur]
Yakovlev, Dmitri [Auteur]
Biadala, Louis [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Physique - IEMN [PHYSIQUE - IEMN]
Crooker, Scott [Auteur]
Los Alamos National Laboratory [LANL]
Belykh, Vasilii [Auteur]
P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] [LPI RAS]
Kochiev, Mikhail [Auteur]
P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] [LPI RAS]
Kuntzmann, Alexis [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Nasilowski, Michel [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Dubertret, Benoit [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Bayer, Manfred [Auteur]
Yakovlev, Dmitri [Auteur]
Biadala, Louis [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Physique - IEMN [PHYSIQUE - IEMN]
Crooker, Scott [Auteur]
Los Alamos National Laboratory [LANL]
Belykh, Vasilii [Auteur]
P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] [LPI RAS]
Kochiev, Mikhail [Auteur]
P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] [LPI RAS]
Kuntzmann, Alexis [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Nasilowski, Michel [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Dubertret, Benoit [Auteur]
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]
Bayer, Manfred [Auteur]
Titre de la revue :
Nano Letters
Pagination :
1370-1377
Éditeur :
American Chemical Society
Date de publication :
2019-12-30
ISSN :
1530-6984
Mot(s)-clé(s) en anglais :
Colloidal nanocrystal
CdSe nanoplatelet
charged exciton
trion
high magnetic fields
CdSe nanoplatelet
charged exciton
trion
high magnetic fields
Discipline(s) HAL :
Physique [physics]/Physique [physics]/Optique [physics.optics]
Résumé en anglais : [en]
Energy Trion Exciton The low-temperature emission spectrum of CdSe colloidal nanoplatelets (NPLs) consists of two narrow lines. The high-energy line stems from the recombination of neutral excitons. The origin of the ...
Lire la suite >Energy Trion Exciton The low-temperature emission spectrum of CdSe colloidal nanoplatelets (NPLs) consists of two narrow lines. The high-energy line stems from the recombination of neutral excitons. The origin of the low-energy line is currently debated. We experimentally study the spectral shift, emission dynamics, and spin polarization of both lines at low temperatures down to 1.5 K and in high magnetic fields up to 60 T, and show that the low energy line originates from the recombination of negatively charged excitons (trions). This assignment is confirmed by the NPL photocharging dynamics and associated variations in the spectrum. We show that the negatively charged excitons are considerably less sensitive to the presence of surface spins than the neutral excitons. The trion binding energy in 3-monolayer-thick NPLs is as large as 30 meV, which is four times larger than its value in two-dimensional limit of a conventional CdSe quantum well confined between semiconductor barriers. A considerable part of this enhancement is gained by the di-electric enhancement effect, that is due to the small dielectric constant of the environment surrounding the NPLs.Lire moins >
Lire la suite >Energy Trion Exciton The low-temperature emission spectrum of CdSe colloidal nanoplatelets (NPLs) consists of two narrow lines. The high-energy line stems from the recombination of neutral excitons. The origin of the low-energy line is currently debated. We experimentally study the spectral shift, emission dynamics, and spin polarization of both lines at low temperatures down to 1.5 K and in high magnetic fields up to 60 T, and show that the low energy line originates from the recombination of negatively charged excitons (trions). This assignment is confirmed by the NPL photocharging dynamics and associated variations in the spectrum. We show that the negatively charged excitons are considerably less sensitive to the presence of surface spins than the neutral excitons. The trion binding energy in 3-monolayer-thick NPLs is as large as 30 meV, which is four times larger than its value in two-dimensional limit of a conventional CdSe quantum well confined between semiconductor barriers. A considerable part of this enhancement is gained by the di-electric enhancement effect, that is due to the small dielectric constant of the environment surrounding the NPLs.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Projet ANR :
Source :
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