Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires
Abstract The three-dimensional structure of GaN/(In,Ga)N core-shell nanowires with multi-faceted pencil-shaped apex is analyzed by electron tomography using high-angle annular dark-field mode in a scanning transmission electron microscope. Selective area growth on GaN-on-sapphire templates using a p...
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Online Access: | http://link.springer.com/article/10.1186/s11671-019-3072-1 |
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doaj-7f8460e186db401181d673a04483ea682020-11-25T03:23:38ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2019-07-0114111010.1186/s11671-019-3072-1Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell NanowiresLars Nicolai0Žarko Gačević1Enrique Calleja2Achim Trampert3Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V.ISOM-ETSIT, Universidad Politécnica de MadridISOM-ETSIT, Universidad Politécnica de MadridPaul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V.Abstract The three-dimensional structure of GaN/(In,Ga)N core-shell nanowires with multi-faceted pencil-shaped apex is analyzed by electron tomography using high-angle annular dark-field mode in a scanning transmission electron microscope. Selective area growth on GaN-on-sapphire templates using a patterned mask is performed by molecular beam epitaxy to obtain ordered arrays of uniform nanowires. Our results of the tomographic reconstruction allow the detailed determination of the complex morphology of the inner (In,Ga)N multi-faceted shell structure and its deviation from the perfect hexagonal symmetry. The tomogram unambiguously identifies a dot-in-a-wire configuration at the nanowire apex including the exact shape and size, as well as the spatial distribution of its chemical composition.http://link.springer.com/article/10.1186/s11671-019-3072-1Electron tomographySTEM(In,Ga)N/GaN nanowireDot-in-a-wireMorphology |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lars Nicolai Žarko Gačević Enrique Calleja Achim Trampert |
spellingShingle |
Lars Nicolai Žarko Gačević Enrique Calleja Achim Trampert Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires Nanoscale Research Letters Electron tomography STEM (In,Ga)N/GaN nanowire Dot-in-a-wire Morphology |
author_facet |
Lars Nicolai Žarko Gačević Enrique Calleja Achim Trampert |
author_sort |
Lars Nicolai |
title |
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires |
title_short |
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires |
title_full |
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires |
title_fullStr |
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires |
title_full_unstemmed |
Electron Tomography of Pencil-Shaped GaN/(In,Ga)N Core-Shell Nanowires |
title_sort |
electron tomography of pencil-shaped gan/(in,ga)n core-shell nanowires |
publisher |
SpringerOpen |
series |
Nanoscale Research Letters |
issn |
1931-7573 1556-276X |
publishDate |
2019-07-01 |
description |
Abstract The three-dimensional structure of GaN/(In,Ga)N core-shell nanowires with multi-faceted pencil-shaped apex is analyzed by electron tomography using high-angle annular dark-field mode in a scanning transmission electron microscope. Selective area growth on GaN-on-sapphire templates using a patterned mask is performed by molecular beam epitaxy to obtain ordered arrays of uniform nanowires. Our results of the tomographic reconstruction allow the detailed determination of the complex morphology of the inner (In,Ga)N multi-faceted shell structure and its deviation from the perfect hexagonal symmetry. The tomogram unambiguously identifies a dot-in-a-wire configuration at the nanowire apex including the exact shape and size, as well as the spatial distribution of its chemical composition. |
topic |
Electron tomography STEM (In,Ga)N/GaN nanowire Dot-in-a-wire Morphology |
url |
http://link.springer.com/article/10.1186/s11671-019-3072-1 |
work_keys_str_mv |
AT larsnicolai electrontomographyofpencilshapedganingancoreshellnanowires AT zarkogacevic electrontomographyofpencilshapedganingancoreshellnanowires AT enriquecalleja electrontomographyofpencilshapedganingancoreshellnanowires AT achimtrampert electrontomographyofpencilshapedganingancoreshellnanowires |
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1724605259689492480 |