Negatively Charged Excitons in CdSe Nanoplatelets

Shornikova, Elena V.; Yakovlev, Dmitri R.; Biadala, Louis; Crooker, Scott A.; Belykh, Vasilii V.; Kochiev, Mikhail V.; Kuntzmann, Alexis; Nasilowski, Michel; Dubertret, Benoit; Bayer, Manfred

doi:10.1021/acs.nanolett.9b04907

Negatively Charged Excitons in CdSe Nanoplatelets

Journal Article · Tue Jan 21 00:00:00 EST 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.9b04907· OSTI ID:1688786

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; Kochiev, Mikhail V. ^[5]; Kuntzmann, Alexis ^[6]; Nasilowski, Michel ^[7]; Dubertret, Benoit ^[7]; Bayer, Manfred ^[2]

Technische Univ. of Dortmund (Germany)
Technische Univ. of Dortmund (Germany); Russian Academy of Sciences (RAS), St. Petersburg (Russian Federation). Ioffe Physical-Technical Institute
Centre National de la Recherche Scientifique (CNRS), Villeneuve-d’Ascq (France). Inst. d’Electronique, de Microélectronique et de Nanotechnologie
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
Russian Academy of Sciences (RAS), Moscow (Russian Federation). P. N. Lebedev Physical Inst.
Centre National de la Recherche Scientifique (CNRS), Paris (France); Ecole Superieure de Physique et de Chimie Industrielles (ESPCI), ParisTech (France)
Laboratoire de Physique et d’Etude des Matériaux, ESPCI, CNRS, 75231 Paris, France

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. Here, 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 three-monolayer-thick NPLs is as large as 30 meV, which is 4 times larger than its value in the two-dimensional limit of a conventional CdSe quantum well confined between semiconductor barriers. A considerable part of this enhancement is gained by the dielectric enhancement effect, which is due to the small dielectric constant of the environment surrounding the NPLs.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: French National Research Agency (ANR); German Research Foundation (DFG); National Science Foundation (NSF); Russian Foundation for Basic Research; Russian Science Foundation (RSF); USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1688786

Report Number(s):: LA-UR--19-31853

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 2 Vol. 20; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets Shornikova, Elena V.; Yakovlev, Dmitri R.; Tolmachev, Danil O. ACS Nano, Vol. 14, Issue 7 https://doi.org/10.1021/acsnano.0c04048	journal	June 2020
Theory of single and double electron spin-flip Raman scattering in semiconductor nanoplatelets Rodina, A. V.; Ivchenko, E. L. arXiv https://doi.org/10.48550/arxiv.2010.10385	text	January 2020
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