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Interplay between Auger and ionization processes in nanocrystal quantum dots

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.
1520-5207
18214-18217
Kraus, Robert M.
6ecf1415-1d2e-4cf2-a15e-43f29d7ff640
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Muller, Josef
b9f0a5d1-0567-455d-ab2f-746a2296ee8f
Rogach, Andrey L.
d53f43f1-5050-4402-8978-56805fc0914e
Lupton, John M.
ae46a2f5-a0dd-4964-a85b-fb73b8b25e73
Feldmann, Jochen
5a16a060-903f-4883-b2cd-4f6aea0f45f3
Talapin, Dimitri V.
00a5262c-3da0-44d2-8c16-c150231ef4f6
Weller, Horst
5a4c22f9-7585-40b3-aa9a-ac6ec3950ad8
Kraus, Robert M.
6ecf1415-1d2e-4cf2-a15e-43f29d7ff640
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Muller, Josef
b9f0a5d1-0567-455d-ab2f-746a2296ee8f
Rogach, Andrey L.
d53f43f1-5050-4402-8978-56805fc0914e
Lupton, John M.
ae46a2f5-a0dd-4964-a85b-fb73b8b25e73
Feldmann, Jochen
5a16a060-903f-4883-b2cd-4f6aea0f45f3
Talapin, Dimitri V.
00a5262c-3da0-44d2-8c16-c150231ef4f6
Weller, Horst
5a4c22f9-7585-40b3-aa9a-ac6ec3950ad8

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, 18214-18217. (doi:10.1021/jp053671y).

Record type: Article

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: https://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: 09 Dec 2019 19:12

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