Effect of a GaAsP Shell on the Optical Properties of Self-Catalyzed GaAs Nanowires Grown on Silicon

Abstract

We realize the growth of self-catalyzed core–shell GaAs/GaAsP nanowires (NWs) on Si substrates using molecular-beam epitaxy. Transmission electron microscopy of single GaAs/GaAsP NWs demonstrates their high crystal quality and shows domination of the GaAs zinc-blende phase. Using continuous-wave and time-resolved photoluminescence (PL), we make a detailed comparison with uncapped GaAs NWs to emphasize the effect of the GaAsP capping in suppressing the nonradiative surface states. Significant PL enhancement in the core–shell structures exceeding 3 orders of magnitude at 10 K is observed; in uncapped NWs PL is quenched at 60 K, whereas single core–shell GaAs/GaAsP structures exhibit bright emission even at room temperature. From analysis of the PL temperature dependence in both types of NW we are able to determine the main carrier escape mechanisms leading to the PL quench.

Metadata

Item Type:	Article
Authors/Creators:	Couto, O.D.D. Sercombe, D. Puebla, J. Otubo, L. Luxmoore, I.J. Sich, M. Elliott, T.J. Chekhovich, E.A. https://orcid.org/0000-0003-1626-9015 Wilson, L.R. Skolnick, M.S. https://orcid.org/0000-0002-3972-8344 Liu, H.Y. Tartakovskii, A.I.
Copyright, Publisher and Additional Information:	This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/nl302490y
Keywords:	emission enhancement; GaAs/GaAsP; molecular beam epitaxy (MBE); Nanowire; room-temperature emission; strain
Dates:	Published: 10 October 2012 Published (online): 18 September 2012
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	03 May 2018 14:08
Last Modified:	03 May 2018 14:08
Published Version:	http://pubs.acs.org/doi/abs/10.1021/nl302490y
Status:	Published
Publisher:	American Chemical Society
Refereed:	Yes
Identification Number:	10.1021/nl302490y
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:130266

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Effect of a GaAsP Shell on the Optical Properties of Self-Catalyzed GaAs Nanowires Grown on Silicon

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