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Defect formation in GaAs/GaNxAs1-x core/shell nanowires
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-7640-8086
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-9421-8411
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5751-6225
Ehime University, Japan.
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2016 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 109, no 20, article id 203103Article in journal (Refereed) Published
Abstract [en]

Photoluminescence and optically detected magnetic resonance (ODMR) spectroscopies are used to investigate the formation and role of defects in GaAs/GaNxAs1-x core/shell nanowires (NWs) grown by molecular beam epitaxy on Si substrates. Gallium vacancies, which act as non-radiative recombination (NRR) centers, are identified by ODMR. It is shown that the defects are formed in bulk regions, i.e., not on the surface, of the GaNAs shell and that their concentration increases with increasing nitrogen content. Temperature dependent photoluminescence experiments reveal, on the other hand, suppressed thermal quenching of the near-band-edge emission with increasing [N]. This leads to the conclusion that the dominant NRR processes in the studied NWs are governed by surface defects, whereas the role of gallium vacancies in the observed thermally activated NRR is minor. Published by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2016. Vol. 109, no 20, article id 203103
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-133112DOI: 10.1063/1.4967721ISI: 000388000000044OAI: oai:DiVA.org:liu-133112DiVA, id: diva2:1055275
Note

Funding Agencies|Swedish Energy Agency [P40119-1]; Swedish Research Council [2015-05532]; Linkoping Linnaeus Initiative for Novel Functional Materials (LiLI-NFM) - Swedish Research Council [2008-6582]; Japan Society for the Promotion of Science [16H05970, 23686004]; Kato Foundation for Promotion of Science; Kurata Memorial Hitachi Science and Technology Foundation; Murata Science Foundation

Available from: 2016-12-12 Created: 2016-12-09 Last updated: 2019-06-28

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