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Core-shell formation in self-induced InAlN nanorods
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-3203-7935
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2837-3656
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 28, no 11, 115602Article in journal (Refereed) Published
Abstract [en]

We have examined the early stages of self-induced InAlN core-shell nanorod (NR) formation processes on amorphous carbon substrates in plan-view geometry by means of transmission electron microscopy methods. The results show that the grown structure phase separates during the initial moments of deposition into a majority of Al-rich InAlN and a minority of In-enriched InAlN islands. The islands possess polygonal shapes and are mainly oriented along a crystallographic c-axis. The growth proceeds with densification and coalescence of the In-enriched islands, resulting in a base for the In-enriched NR cores with shape transformation to hexagonal. The Al-rich shell formation around such early cores is observed at this stage. The matured core-shell structure grows axially and radially, eventually reaching a steady growth state which is dominated by the axial NR growth. We discuss the NR formation mechanism by considering the adatom surface kinetics, island surface energy, phase separation of InAlN alloys, and incoming flux directions during dual magnetron sputter epitaxy.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 28, no 11, 115602
Keyword [en]
InAlN; core-shell nanorods; surface kinetics; transmission electron microscopy; formation mechanism
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-137865DOI: 10.1088/1361-6528/aa59f2ISI: 000400813000001PubMedID: 28181478OAI: oai:DiVA.org:liu-137865DiVA: diva2:1105040
Note

Funding Agencies|Swedish Research Council (under VR Contracts) [621-2012-4359, 622-2008-405]; Swedish foundation for strategic research (SSF); Olle Engstrom foundation; VR [621-2012-4420]; Wallenberg Scholar Grant; Wallenberg Foundation

Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02

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