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Giant suppression of Auger electron cooling in charged nanocrystals

Califano, M. (2007) Giant suppression of Auger electron cooling in charged nanocrystals. Applied Physics Letters, 91 (17). p. 172114. ISSN 00036951

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This letter presents a detailed study of the electron relaxation lifetimes from the excited p-like state into the ground s-like state via Auger cooling in positively and negatively charged CdSe nanocrystals, where the dependence of Auger cooling rates on size, temperature and carrier-carrier interaction effects is investigated. A nearly two-orders-of-magnitude reduction of Auger rates is found in small nanocrystals populated by two electrons and one hole at room temperature. This effect increases with decreasing temperature leading to a total lifetime increase of up to 4 orders of magnitude for T ∼ 10 K. Such a giant suppression of Auger cooling rates appears to be a general property of semiconductor nanocrystals. A similar reduction of Auger rates at room T is found in negatively charged PbSe nanocrystals as well.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 American Institute Physics. This is an author produced version of a paper published in Applied Physics Letters. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 18 Dec 2007 16:47
Last Modified: 08 Feb 2013 17:05
Published Version: http://dx.doi.org/10.1063/1.2803296
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.2803296
URI: http://eprints.whiterose.ac.uk/id/eprint/3543

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