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Direct nucleation, morphology and compositional tuning of InAs1-xSb x nanowires on InAs (111) B substrates

Namazi, Luna LU ; Ghalamestani, Sepideh Gorji LU ; Lehmann, Sebastian LU ; Zamani, Reza R. LU and Dick, Kimberly A. LU (2017) In Nanotechnology 28(16).
Abstract

III-V ternary nanowires are interesting due to the possibility of modulating their physical and material properties by tuning their material composition. Amongst them InAs1-xSb x nanowires are good candidates for applications such as Infrared detectors. However, this material has not been grown directly from substrates, in a large range of material compositions. Since the properties of ternaries are alterable by tuning their composition, it is beneficial to gain access to a wide range of composition tunability. Here we demonstrate direct nucleation and growth of InAs1-xSb x nanowires from Au seed particles over a broad range of compositions (x = 0.08-0.75) for different diameters and surface... (More)

III-V ternary nanowires are interesting due to the possibility of modulating their physical and material properties by tuning their material composition. Amongst them InAs1-xSb x nanowires are good candidates for applications such as Infrared detectors. However, this material has not been grown directly from substrates, in a large range of material compositions. Since the properties of ternaries are alterable by tuning their composition, it is beneficial to gain access to a wide range of composition tunability. Here we demonstrate direct nucleation and growth of InAs1-xSb x nanowires from Au seed particles over a broad range of compositions (x = 0.08-0.75) for different diameters and surface densities by means of metalorganic vapor phase epitaxy. We investigate how the nucleation, morphology, solid phase Sb content, and growth rate of these nanowires depend on the particle dimensions, and on growth conditions such as the vapor phase composition, V/III ratio, and temperature. We show that the solid phase Sb content of the nanowires remains invariant towards changes of the In precursor flow. We also discuss that at relatively high In flows the growth mechanism alters from Au-seeded to what is referred to as semi In-seeded growth. This change enables growth of nanowires with a high solid phase Sb content of 0.75 that are not feasible via Au-seeded growth. Independent of the growth conditions and morphology, we report that the nanowire Sb content changes over their length, from lower Sb contents at the base, increasing to higher amounts towards the tip. We correlate the axial Sb content variations to the axial growth rate measured in situ. We also report spontaneous core-shell formation for Au-seeded nanowires, where the core is Sb-rich in comparison to the Sb-poor shell.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
antimonide, Au-seeded, direct nucleation, III-V nanowire, InAsSb, material tenability, ternary
in
Nanotechnology
volume
28
issue
16
publisher
IOP Publishing
external identifiers
  • scopus:85016142109
  • wos:000397935200001
ISSN
0957-4484
DOI
10.1088/1361-6528/aa6518
language
English
LU publication?
yes
id
84c53f2b-bee1-4a8b-ae96-b53af5e841a4
date added to LUP
2017-04-05 08:40:48
date last changed
2017-09-18 13:31:24
@article{84c53f2b-bee1-4a8b-ae96-b53af5e841a4,
  abstract     = {<p>III-V ternary nanowires are interesting due to the possibility of modulating their physical and material properties by tuning their material composition. Amongst them InAs<sub>1-x</sub>Sb <sub>x</sub> nanowires are good candidates for applications such as Infrared detectors. However, this material has not been grown directly from substrates, in a large range of material compositions. Since the properties of ternaries are alterable by tuning their composition, it is beneficial to gain access to a wide range of composition tunability. Here we demonstrate direct nucleation and growth of InAs<sub>1-x</sub>Sb <sub>x</sub> nanowires from Au seed particles over a broad range of compositions (x = 0.08-0.75) for different diameters and surface densities by means of metalorganic vapor phase epitaxy. We investigate how the nucleation, morphology, solid phase Sb content, and growth rate of these nanowires depend on the particle dimensions, and on growth conditions such as the vapor phase composition, V/III ratio, and temperature. We show that the solid phase Sb content of the nanowires remains invariant towards changes of the In precursor flow. We also discuss that at relatively high In flows the growth mechanism alters from Au-seeded to what is referred to as semi In-seeded growth. This change enables growth of nanowires with a high solid phase Sb content of 0.75 that are not feasible via Au-seeded growth. Independent of the growth conditions and morphology, we report that the nanowire Sb content changes over their length, from lower Sb contents at the base, increasing to higher amounts towards the tip. We correlate the axial Sb content variations to the axial growth rate measured in situ. We also report spontaneous core-shell formation for Au-seeded nanowires, where the core is Sb-rich in comparison to the Sb-poor shell.</p>},
  articleno    = {165601},
  author       = {Namazi, Luna and Ghalamestani, Sepideh Gorji and Lehmann, Sebastian and Zamani, Reza R. and Dick, Kimberly A.},
  issn         = {0957-4484},
  keyword      = {antimonide,Au-seeded,direct nucleation,III-V nanowire,InAsSb,material tenability,ternary},
  language     = {eng},
  month        = {03},
  number       = {16},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Direct nucleation, morphology and compositional tuning of InAs<sub>1-x</sub>Sb <sub>x</sub> nanowires on InAs (111) B substrates},
  url          = {http://dx.doi.org/10.1088/1361-6528/aa6518},
  volume       = {28},
  year         = {2017},
}