Nature and Control of Shakeup Processes in Colloidal Nanoplatelets
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Título
Nature and Control of Shakeup Processes in Colloidal NanoplateletsFecha de publicación
2020-10-29Editor
American Chemical SocietyISSN
2330-4022Cita bibliográfica
LLUSAR, Jordi; CLIMENTE, Juan I. Nature and Control of Shakeup Processes in Colloidal Nanoplatelets. ACS Photonics, 2020, vol. 7, no 11, p. 3086-3095.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/10.1021/acsphotonics.0c01160Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
Recent experiments suggest that the photoluminescence line
width of CdSe nanoplatelets (NPLs) and core/shell CdSe/CdS NPLs may be
broadened by the presence of shakeup (SU) lines from negatively charged
trions. We ... [+]
Recent experiments suggest that the photoluminescence line
width of CdSe nanoplatelets (NPLs) and core/shell CdSe/CdS NPLs may be
broadened by the presence of shakeup (SU) lines from negatively charged
trions. We carry out a theoretical analysis, based on effective mass and
configuration interaction (CI) simulations, to identify the physical conditions
that enable such processes. We confirm that trions in colloidal NPLs are
susceptible of presenting SU lines up to 1 order of magnitude stronger than in
epitaxial quantum wells, stimulated by dielectric confinement. For these
processes to take place, trions must be weakly bound to off-centered charge
traps, which relax symmetry selection rules. Charges on the lateral sidewalls are
particularly efficient to this end. Our simulations display a single strong SU
replica in most instances, which agrees well with experiments on CdSe NPLs, but suggests that the multipeaked emission reported
for core/shell CdSe/CdS NPLs must involve other factors beyond SU processes. We propose emission from a metastable spin triplet
trion state may be responsible. Understanding the origin of SU processes may open paths to rational design of NPLs with narrower
line width. [-]
Publicado en
ACS Photonics, 2020, vol. 7, no 11.Entidad financiadora
MICINN Project
Código del proyecto o subvención
CTQ2017-83781-P
Derechos de acceso
Copyright © 2020 American Chemical Society. “This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsphotonics.0c01160.”
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