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GaAs/AlGaAs nanowire heterostructures studied by scanning tunneling microscopy

Ouattara, Lassana LU ; Mikkelsen, Anders LU ; Sköld, Niklas LU ; Bolinsson, Jessica LU ; Knaapen, Thijs; Cavar, Elizabeta LU ; Seifert, Werner LU ; Samuelson, Lars LU and Lundgren, Edvin LU (2007) In Nano Letters 7(9). p.2859-2864
Abstract
We directly image the interior of GaAs/AlGaAs axial and radial nanowire heterostructures with atomic-scale resolution using scanning tunneling microscopy. We show that formation of monolayer sharp and smooth axial interfaces are possible even by vapor-phase epitaxy. However, we also find that instability of the ternary alloys formed in the Au seed fundamentally limits axial heterostructure control, inducing large segment asymmetries. We study radial core-shell nanowires, imaging even ultrathin submonolayer shells. We demonstrate how large twinning-induced morphological defects at the wire surfaces can be removed, ensuring the formation of wires with atomically flat sides.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
7
issue
9
pages
2859 - 2864
publisher
The American Chemical Society
external identifiers
  • wos:000249501900057
  • scopus:34948907990
ISSN
1530-6992
DOI
10.1021/nl071550z
language
English
LU publication?
yes
id
4c7b81af-c0a1-43b0-9f01-04616a09dd3f (old id 656472)
date added to LUP
2007-12-17 09:11:24
date last changed
2017-11-12 04:03:13
@article{4c7b81af-c0a1-43b0-9f01-04616a09dd3f,
  abstract     = {We directly image the interior of GaAs/AlGaAs axial and radial nanowire heterostructures with atomic-scale resolution using scanning tunneling microscopy. We show that formation of monolayer sharp and smooth axial interfaces are possible even by vapor-phase epitaxy. However, we also find that instability of the ternary alloys formed in the Au seed fundamentally limits axial heterostructure control, inducing large segment asymmetries. We study radial core-shell nanowires, imaging even ultrathin submonolayer shells. We demonstrate how large twinning-induced morphological defects at the wire surfaces can be removed, ensuring the formation of wires with atomically flat sides.},
  author       = {Ouattara, Lassana and Mikkelsen, Anders and Sköld, Niklas and Bolinsson, Jessica and Knaapen, Thijs and Cavar, Elizabeta and Seifert, Werner and Samuelson, Lars and Lundgren, Edvin},
  issn         = {1530-6992},
  language     = {eng},
  number       = {9},
  pages        = {2859--2864},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {GaAs/AlGaAs nanowire heterostructures studied by scanning tunneling microscopy},
  url          = {http://dx.doi.org/10.1021/nl071550z},
  volume       = {7},
  year         = {2007},
}