Negatively Charged Excitons in CdSe Nanoplatelets
| Autor: | M. V. Kochiev, Elena V. Shornikova, Scott A. Crooker, Louis Biadala, Manfred Bayer, Benoit Dubertret, Alexis Kuntzmann, V. V. Belykh, Michel Nasilowski, Dmitri R. Yakovlev |
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| Přispěvatelé: | Experimentelle Physik 2, Technische Universität Dortmund [Dortmund] (TU), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Los Alamos National Laboratory (LANL), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Physique - IEMN (PHYSIQUE - IEMN), ANR-19-CE09-0022,TROPICAL,Propriétés électronique et optique de puits quantiques colloidaux à l'échelle individuelle(2019) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
charged exciton high magnetic fields Exciton CdSe nanoplatelet Binding energy Bioengineering 02 engineering and technology Dielectric 7. Clean energy Molecular physics Condensed Matter::Materials Science General Materials Science Emission spectrum Quantum well [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Spins Spin polarization Condensed Matter::Other Mechanical Engineering trion General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Colloidal nanocrystal Trion 0210 nano-technology |
| Zdroj: | Nano Letters Nano Letters, American Chemical Society, 2019, 20 (2), pp.1370-1377. ⟨10.1021/acs.nanolett.9b04907⟩ Nano Letters, 2019, 20 (2), pp.1370-1377. ⟨10.1021/acs.nanolett.9b04907⟩ |
| ISSN: | 1530-6984 1530-6992 |
| DOI: | 10.1021/acs.nanolett.9b04907⟩ |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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