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Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory

Hjort, Martin LU ; Lehmann, Sebastian LU ; Knutsson, Johan LU ; Zakharov, Alexei LU ; Du, Yaojun A.; Sakong, Sung; Timm, Rainer LU ; Nylund, Gustav LU ; Lundgren, Edvin LU and Kratzer, Peter, et al. (2014) In ACS Nano 8(12). p.12346-12355
Abstract
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... (More)
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. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
STM, InAs nanowire, surface, STS, PEEM, wurtzite
in
ACS Nano
volume
8
issue
12
pages
12346 - 12355
publisher
The American Chemical Society
external identifiers
  • wos:000347138000047
  • scopus:84919756198
ISSN
1936-086X
DOI
10.1021/nn504795v
language
English
LU publication?
yes
id
a5e4738e-97cc-4a0e-8651-0343b92a1340 (old id 5085362)
date added to LUP
2015-02-26 13:03:03
date last changed
2017-11-19 03:09:11
@article{a5e4738e-97cc-4a0e-8651-0343b92a1340,
  abstract     = {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.},
  author       = {Hjort, Martin and Lehmann, Sebastian and Knutsson, Johan and Zakharov, Alexei and Du, Yaojun A. and Sakong, Sung and Timm, Rainer and Nylund, Gustav and Lundgren, Edvin and Kratzer, Peter and Dick Thelander, Kimberly and Mikkelsen, Anders},
  issn         = {1936-086X},
  keyword      = {STM,InAs nanowire,surface,STS,PEEM,wurtzite},
  language     = {eng},
  number       = {12},
  pages        = {12346--12355},
  publisher    = {The American Chemical Society},
  series       = {ACS Nano},
  title        = {Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory},
  url          = {http://dx.doi.org/10.1021/nn504795v},
  volume       = {8},
  year         = {2014},
}