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Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory
[Image: see text] We determine the detailed differences in geometry and band structure between wurtzite (Wz) and zinc blende (Zb) InAs nanowire (NW) surfaces using scanning tunneling microscopy/spectroscopy and photoemission electron microscopy. By establishing unreconstructed and defect-free surfac...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2014
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4278418/ https://www.ncbi.nlm.nih.gov/pubmed/25406069 http://dx.doi.org/10.1021/nn504795v |
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author | Hjort, Martin Lehmann, Sebastian Knutsson, Johan Zakharov, Alexei A. Du, Yaojun A. Sakong, Sung Timm, Rainer Nylund, Gustav Lundgren, Edvin Kratzer, Peter Dick, Kimberly A. Mikkelsen, Anders |
author_facet | Hjort, Martin Lehmann, Sebastian Knutsson, Johan Zakharov, Alexei A. Du, Yaojun A. Sakong, Sung Timm, Rainer Nylund, Gustav Lundgren, Edvin Kratzer, Peter Dick, Kimberly A. Mikkelsen, Anders |
author_sort | Hjort, Martin |
collection | PubMed |
description | [Image: see text] We determine the detailed differences in geometry and band structure between wurtzite (Wz) and zinc blende (Zb) InAs nanowire (NW) surfaces using scanning tunneling microscopy/spectroscopy and photoemission electron microscopy. By establishing unreconstructed and defect-free surface facets for both Wz and Zb, we can reliably measure differences between valence and conduction band edges, the local vacuum levels, and geometric relaxations to the few-millielectronvolt and few-picometer levels, respectively. Surface and bulk density functional theory calculations agree well with the experimental findings and are used to interpret the results, allowing us to obtain information on both surface and bulk electronic structure. We can thus exclude several previously proposed explanations for the observed differences in conductivity of Wz-Zb NW devices. Instead, fundamental structural differences at the atomic scale and nanoscale that we observed between NW surface facets can explain the device behavior. |
format | Online Article Text |
id | pubmed-4278418 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-42784182014-12-29 Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory Hjort, Martin Lehmann, Sebastian Knutsson, Johan Zakharov, Alexei A. Du, Yaojun A. Sakong, Sung Timm, Rainer Nylund, Gustav Lundgren, Edvin Kratzer, Peter Dick, Kimberly A. Mikkelsen, Anders ACS Nano [Image: see text] We determine the detailed differences in geometry and band structure between wurtzite (Wz) and zinc blende (Zb) InAs nanowire (NW) surfaces using scanning tunneling microscopy/spectroscopy and photoemission electron microscopy. By establishing unreconstructed and defect-free surface facets for both Wz and Zb, we can reliably measure differences between valence and conduction band edges, the local vacuum levels, and geometric relaxations to the few-millielectronvolt and few-picometer levels, respectively. Surface and bulk density functional theory calculations agree well with the experimental findings and are used to interpret the results, allowing us to obtain information on both surface and bulk electronic structure. We can thus exclude several previously proposed explanations for the observed differences in conductivity of Wz-Zb NW devices. Instead, fundamental structural differences at the atomic scale and nanoscale that we observed between NW surface facets can explain the device behavior. American Chemical Society 2014-11-18 2014-12-23 /pmc/articles/PMC4278418/ /pubmed/25406069 http://dx.doi.org/10.1021/nn504795v Text en Copyright © 2014 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Hjort, Martin Lehmann, Sebastian Knutsson, Johan Zakharov, Alexei A. Du, Yaojun A. Sakong, Sung Timm, Rainer Nylund, Gustav Lundgren, Edvin Kratzer, Peter Dick, Kimberly A. Mikkelsen, Anders Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title | Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title_full | Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title_fullStr | Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title_full_unstemmed | Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title_short | Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory |
title_sort | electronic and structural differences between wurtzite and zinc blende inas nanowire surfaces: experiment and theory |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4278418/ https://www.ncbi.nlm.nih.gov/pubmed/25406069 http://dx.doi.org/10.1021/nn504795v |
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