Negatively Charged Excitons in CdSe Nanoplatelets
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Negatively Charged Excitons in CdSe Nanoplatelets
Author(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]
Journal title :
Nano Letters
Pages :
1370-1377
Publisher :
American Chemical Society
Publication date :
2019-12-30
ISSN :
1530-6984
English keyword(s) :
Colloidal nanocrystal
CdSe nanoplatelet
charged exciton
trion
high magnetic fields
CdSe nanoplatelet
charged exciton
trion
high magnetic fields
HAL domain(s) :
Physique [physics]/Physique [physics]/Optique [physics.optics]
English abstract : [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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Popular science :
Non
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