Interplay between Auger and ionization processes in nanocrystal quantum dots
Interplay between Auger and ionization processes in nanocrystal quantum dots
We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates.
18214-18217
Kraus, Robert M.
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Lagoudakis, Pavlos G.
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Muller, Josef
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Rogach, Andrey L.
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Lupton, John M.
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Feldmann, Jochen
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Talapin, Dimitri V.
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Weller, Horst
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July 2005
Kraus, Robert M.
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Lagoudakis, Pavlos G.
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Muller, Josef
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Rogach, Andrey L.
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Lupton, John M.
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Feldmann, Jochen
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Talapin, Dimitri V.
00a5262c-3da0-44d2-8c16-c150231ef4f6
Weller, Horst
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Kraus, Robert M., Lagoudakis, Pavlos G., Muller, Josef, Rogach, Andrey L., Lupton, John M., Feldmann, Jochen, Talapin, Dimitri V. and Weller, Horst
(2005)
Interplay between Auger and ionization processes in nanocrystal quantum dots.
The Journal of Physical Chemistry B, 109, .
(doi:10.1021/jp053671y).
Abstract
We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates.
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Published date: July 2005
Identifiers
Local EPrints ID: 19271
URI: http://eprints.soton.ac.uk/id/eprint/19271
ISSN: 1520-5207
PURE UUID: 27cf6324-2f59-470f-aa5f-ce1813810bb3
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Date deposited: 30 Jan 2006
Last modified: 15 Mar 2024 06:13
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Contributors
Author:
Robert M. Kraus
Author:
Pavlos G. Lagoudakis
Author:
Josef Muller
Author:
Andrey L. Rogach
Author:
John M. Lupton
Author:
Jochen Feldmann
Author:
Dimitri V. Talapin
Author:
Horst Weller
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