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Position-controlled growth of GaN nanowires and nanotubes on diamond by molecular beam epitaxy
Schuster, Fabian (Walter Schottky Institut, Physics Department, Technische Universität München)
Hetzl, Martin (Technische Universität München. Walter Schottky Institute)
Weiszer, Saskia (Technische Universität München. Walter Schottky Institute)
Garrido Ariza, José A. (Technische Universität München. Walter Schottky Institute)
De La Mata, Maria (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC))
Magén, César (Universidad de Zaragoza. Instituto de Nanociencia de Aragón)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Stutzmann, Martin (Technische Universität München. Walter Schottky Institute)
ALBA Laboratori de Llum de Sincrotró

Date: 2015
Abstract: In this work the position-controlled growth of GaN nanowires (NWs) on diamond by means of molecular beam epitaxy is investigated. In terms of growth, diamond can be seen as a model substrate, providing information of systematic relevance also for other substrates. Thin Ti masks are structured by electron beam lithography which allows the fabrication of perfectly homogeneous GaN NW arrays with different diameters and distances. While the wurtzite NWs are found to be Ga-polar, N-polar nucleation leads to the formation of tripod structures with a zinc-blende core which can be efficiently suppressed above a substrate temperature of 870 °C. A variation of the III/V flux ratio reveals that both axial and radial growth rates are N-limited despite the globally N-rich growth conditions, which is explained by the different diffusion behavior of Ga and N atoms. Furthermore, it is shown that the hole arrangement has no effect on the selectivity but can be used to force a transition from nanowire to nanotube growth by employing a highly competitive growth regime.
Note: Número d'acord de subvenció MINECO/MAT2014-51480-ERC
Note: Número d'acord de subvenció AGAUR/2014/SGR-1638
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: GaN ; Molecular beam epitaxy ; Nanowires ; Polarity ; Proximity effects ; Selective area growth
Published in: Nano letters, Vol. 15, issue 3 (Nov. 2015) , p. 1773-1779, ISSN 1530-6992

DOI: 10.1021/nl504446r


Postprint
8 p, 9.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2018-12-17, last modified 2019-09-05



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