Comparison between Trion and Exciton Electronic Properties in CdSe and PbS Nanoplatelets
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Títol
Comparison between Trion and Exciton Electronic Properties in CdSe and PbS NanoplateletsData de publicació
2021-07-07Editor
American Chemical SocietyISSN
1932-7447; 1932-7455Cita bibliogràfica
David F. Macias-Pinilla, Josep Planelles, Iván Mora-Seró, and Juan I. Climente The Journal of Physical Chemistry C 2021 125 (28), 15614-15622 DOI: 10.1021/acs.jpcc.1c03880Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://pubs.acs.org/journal/jpccckVersió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
The optoelectronic properties of metal chalcogenide
colloidal nanoplatelets are often interpreted in terms of excitonic
states. However, recent spectroscopic experiments evidence the
presence of trion states, enabled ... [+]
The optoelectronic properties of metal chalcogenide
colloidal nanoplatelets are often interpreted in terms of excitonic
states. However, recent spectroscopic experiments evidence the
presence of trion states, enabled by the slow Auger recombination
in these structures. We analyze how the presence of an additional
charge in trions modifies the emission energy and oscillator
strength as compared to neutral excitons. These properties are very
sensitive to dielectric confinement and electronic correlations,
which we describe accurately using the image-charge and
variational Quantum Monte Carlo methods in effective mass
Hamiltonians. We observe that the giant oscillator strength of neutral excitons is largely suppressed in trions. Both negative and
positive trions are red-shifted with respect to the exciton, and their emission energy increases with increasing dielectric mismatch
between the platelet and its surroundings, which is a consequence of the self-energy potential. Our results are consistent with
experiments in the literature and assess the validity of previous theoretical approximations. [-]
Publicat a
J. Phys. Chem. C 2021, 125, 15614−15622Entitat finançadora
Ministerio de Asuntos Económicos y Transformación Digital | European Research Council (ERC) | Generalitat Valenciana
Codi del projecte o subvenció
CTQ2017-83781-P (J.P., J.I.C.) | 724424-No-LIMIT (D.F.M.-P., I.M.-S.) | Prometeo/2018/098
Drets d'accés
Copyright © 2021 American Chemical Society
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info:eu-repo/semantics/openAccess
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
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