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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...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2014
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.
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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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