Piezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS Nanocrystals
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comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Title
Piezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS NanocrystalsAuthor (s)
Date
2016-05-25Publisher
American Chemical SocietyISSN
1948-7185Bibliographic citation
SEGARRA, Carlos, et al. Piezoelectric Control of the Exciton Wave Function in Colloidal CdSe/CdS Nanocrystals. The journal of physical chemistry letters, 2016, vol. 7, p. 2182-2188Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/full/10.1021/acs.jpclett.6b00622Version
info:eu-repo/semantics/publishedVersionSubject
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Abstract
Using multiband k·p calculations, we show that strain-engineered piezoelectricity
is a powerful tool to modulate the electron−hole spatial separation in a wide class of
wurtzite CdSe/CdS nanocrystals. The inherent ... [+]
Using multiband k·p calculations, we show that strain-engineered piezoelectricity
is a powerful tool to modulate the electron−hole spatial separation in a wide class of
wurtzite CdSe/CdS nanocrystals. The inherent anisotropy of the hexagonal crystal structure
leads to anisotropic strain and, consequently, to a pronounced piezoelectric field along the c
axis, which can be amplified or quenched through a proper design of the core−shell structure.
The use of large cores and thick shells promotes a gradual departure from quantum confined
nanocrystals to a regime dominated by piezoelectric confinement. This allows excitons to
evolve from the usual type-I and quasi-type-II behavior to a type-II behavior in dot-in-dots,
dot-in-rods, rod-in-rods, and dot-in-plates. Piezoelectric fields explain experimental
observations for giant-shell nanocrystals, whose time-resolved photoluminescence reveals
long exciton lifetimes for large cores, contrary to the expectations of standard quantum
confinement models. They also explain the large differences in exciton lifetimes reported for
different classes of CdSe/CdS nanocrystals. [-]
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The journal of physical chemistry letters, 2016, vol. 7Rights
Copyright © 2016 American Chemical Society
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