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Growth of InAs/InP core-shell nanowires with various pure crystal structures.

Gorji, Sepideh LU ; Heurlin, Magnus LU ; Wernersson, Lars-Erik LU ; Lehmann, Sebastian LU and Dick Thelander, Kimberly LU (2012) In Nanotechnology 23(28).
Abstract
We have studied the epitaxial growth of an InP shell on various pure InAs core nanowire crystal structures by metal-organic vapor phase epitaxy. The InP shell is grown on wurtzite (WZ), zinc-blende (ZB), and {111}- and {110}-type faceted ZB twin-plane superlattice (TSL) structures by tuning the InP shell growth parameters and controlling the shell thickness. The growth results, particularly on the WZ nanowires, show that homogeneous InP shell growth is promoted at relatively high temperatures (∼500 °C), but that the InAs nanowires decompose under the applied conditions. In order to protect the InAs core nanowires from decomposition, a short protective InP segment is first grown axially at lower temperatures (420-460 °C), before commencing... (More)
We have studied the epitaxial growth of an InP shell on various pure InAs core nanowire crystal structures by metal-organic vapor phase epitaxy. The InP shell is grown on wurtzite (WZ), zinc-blende (ZB), and {111}- and {110}-type faceted ZB twin-plane superlattice (TSL) structures by tuning the InP shell growth parameters and controlling the shell thickness. The growth results, particularly on the WZ nanowires, show that homogeneous InP shell growth is promoted at relatively high temperatures (∼500 °C), but that the InAs nanowires decompose under the applied conditions. In order to protect the InAs core nanowires from decomposition, a short protective InP segment is first grown axially at lower temperatures (420-460 °C), before commencing the radial growth at a higher temperature. Further studies revealed that the InP radial growth rate is significantly higher on the ZB and TSL nanowires compared to WZ counterparts, and shows a strong anisotropy in polar directions. As a result, thin shells were obtained during low temperature InP growth on ZB structures, while a higher temperature was used to obtain uniform thick shells. In addition, a schematic growth model is suggested to explain the basic processes occurring during the shell growth on the TSL crystal structures. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanotechnology
volume
23
issue
28
publisher
IOP Publishing
external identifiers
  • wos:000305972600005
  • pmid:22717421
  • scopus:84862859740
ISSN
0957-4484
DOI
10.1088/0957-4484/23/28/285601
language
English
LU publication?
yes
id
fd57dfe9-5760-4d44-bc4b-7c59f115068c (old id 2859216)
date added to LUP
2012-07-06 14:41:39
date last changed
2017-10-08 03:01:54
@article{fd57dfe9-5760-4d44-bc4b-7c59f115068c,
  abstract     = {We have studied the epitaxial growth of an InP shell on various pure InAs core nanowire crystal structures by metal-organic vapor phase epitaxy. The InP shell is grown on wurtzite (WZ), zinc-blende (ZB), and {111}- and {110}-type faceted ZB twin-plane superlattice (TSL) structures by tuning the InP shell growth parameters and controlling the shell thickness. The growth results, particularly on the WZ nanowires, show that homogeneous InP shell growth is promoted at relatively high temperatures (∼500 °C), but that the InAs nanowires decompose under the applied conditions. In order to protect the InAs core nanowires from decomposition, a short protective InP segment is first grown axially at lower temperatures (420-460 °C), before commencing the radial growth at a higher temperature. Further studies revealed that the InP radial growth rate is significantly higher on the ZB and TSL nanowires compared to WZ counterparts, and shows a strong anisotropy in polar directions. As a result, thin shells were obtained during low temperature InP growth on ZB structures, while a higher temperature was used to obtain uniform thick shells. In addition, a schematic growth model is suggested to explain the basic processes occurring during the shell growth on the TSL crystal structures.},
  articleno    = {285601},
  author       = {Gorji, Sepideh and Heurlin, Magnus and Wernersson, Lars-Erik and Lehmann, Sebastian and Dick Thelander, Kimberly},
  issn         = {0957-4484},
  language     = {eng},
  number       = {28},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Growth of InAs/InP core-shell nanowires with various pure crystal structures.},
  url          = {http://dx.doi.org/10.1088/0957-4484/23/28/285601},
  volume       = {23},
  year         = {2012},
}