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Photoluminescence quantum efficiency of dense silicon nanocrystal ensembles in SiO2

Walters, R. J. and Kalkman, J. and Polman, A. and Atwater, H. A. and de Dood, M. J. A. (2006) Photoluminescence quantum efficiency of dense silicon nanocrystal ensembles in SiO2. Physical Review B, 73 (13). Art. No. 132302. ISSN 1098-0121. https://resolver.caltech.edu/CaltechAUTHORS:WALprb06

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Abstract

The photoluminescence decay characteristics of silicon nanocrystals in dense ensembles fabricated by ion implantation into silicon dioxide are observed to vary in proportion to the calculated local density of optical states. A comparison of the experimental 1/e photoluminescence decay rates to the expected spontaneous emission rate modification yields values for the internal quantum efficiency and the intrinsic radiative decay rate of silicon nanocrystals. A photoluminescence quantum efficiency as high as 59%±9% is found for nanocrystals emitting at 750 nm at low excitation power. A power dependent nonradiative decay mechanism reduces the quantum efficiency at high pump intensity.


Item Type:Article
ORCID:
AuthorORCID
Atwater, H. A.0000-0001-9435-0201
Additional Information:© 2006 The American Physical Society (Received 13 September 2005; revised 27 February 2006; published 28 April 2006) This work was supported by the Air Force Office of Scientific Research (MURI No. FA9550-04-1-0434) and the research program of FOM, which is financially supported by NWO. Technical development by Nicholas Chiang is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-04-1-0434
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Subject Keywords:silicon; silicon compounds; elemental semiconductors; nanostructured materials; photoluminescence; ion implantation; electronic density of states; spontaneous emission
Issue or Number:13
Record Number:CaltechAUTHORS:WALprb06
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:WALprb06
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.73.132302
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6705
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:18 Dec 2006
Last Modified:02 Oct 2019 23:35

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