Composition profiling InAs quantum dots and wetting layers by atom probe tomography and cross-sectional scanning tunnelling microscopy

This study compares cross-sectional scanning tunnelling microscopy (XSTM) and atom probe tomography (APT). We use epitaxially grown self-assembled InAs quantum dots (QDs) in GaAs as an exemplary material with which to compare these two nanostructural analysis techniques. We studied the composition o...

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Bibliographic Details
Published inarXiv.org
Main Authors Giddings, A D, Keizer, J G, Hara, M, Hamhuis, G J, Yuasa, H, Fukuzawa, H, Koenraad, P M
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 25.01.2011
Subjects
Composition
Epitaxial growth
Mathematical models
Microscopy
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Quantum dots
Scanning tunneling microscopy
Self-assembly
Tomography
Wetting
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Summary:This study compares cross-sectional scanning tunnelling microscopy (XSTM) and atom probe tomography (APT). We use epitaxially grown self-assembled InAs quantum dots (QDs) in GaAs as an exemplary material with which to compare these two nanostructural analysis techniques. We studied the composition of the wetting layer and the QDs, and performed quantitative comparisons of the indium concentration profiles measured by each method. We show that computational models of the wetting layer and the QDs, based on experimental data, are consistent with both analytical approaches. This establishes a link between the two techniques and shows their complimentary behaviour, an advantage which we exploit in order to highlight unique features of the examined QD material.
ISSN:2331-8422
DOI:10.48550/arxiv.1010.5888