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Kinetic Engineering of Wurtzite and Zinc-Blende AlSb Shells on InAs Nanowires

Kindlund, Hanna LU ; Zamani, Reza R. LU ; Persson, Axel R. LU ; Lehmann, Sebastian LU ; Wallenberg, L. Reine LU and Dick, Kimberly A. LU (2018) In Nano Letters 18(9). p.5775-5781
Abstract

Using AlSb as the model system, we demonstrate that kinetic limitations can lead to the preferential growth of wurtzite (WZ) AlSb shells rather than the thermodynamically stable zinc-blende (ZB) AlSb and that the WZ and ZB relative thickness can be tuned by a careful control of the deposition parameters. We report selective heteroepitaxial radial growth of AlSb deposited by metal-organic vapor phase epitaxy (MOVPE) on InAs nanowire core templates with engineered lengths of axial WZ and ZB segments. AlSb shell thickness, crystal phase, nanostructure, and composition are investigated as a function of the shell growth temperature, Ts, using scanning electron microscopy, transmission electron microscopy, electron tomography, and... (More)

Using AlSb as the model system, we demonstrate that kinetic limitations can lead to the preferential growth of wurtzite (WZ) AlSb shells rather than the thermodynamically stable zinc-blende (ZB) AlSb and that the WZ and ZB relative thickness can be tuned by a careful control of the deposition parameters. We report selective heteroepitaxial radial growth of AlSb deposited by metal-organic vapor phase epitaxy (MOVPE) on InAs nanowire core templates with engineered lengths of axial WZ and ZB segments. AlSb shell thickness, crystal phase, nanostructure, and composition are investigated as a function of the shell growth temperature, Ts, using scanning electron microscopy, transmission electron microscopy, electron tomography, and energy-dispersive X-ray spectroscopy. We find that ZB- and WZ-structured AlSb shells grow heteroepitaxially around the ZB and WZ segments of the InAs core, respectively. Surprisingly, at 390 < Ts < 450 °C, the WZ-AlSb shells are thicker than the ZB-AlSb shells, and their thickness increases with decreasing Ts. In comparison, the ZB-AlSb shell thicknesses increase slightly with increasing Ts. We find that the increased thickness of the WZ-AlSb shells is due to the formation and enhanced deposition on {112-0} facets rather than on the more commonly grown {101-0} sidewall facets. Overall, these results, which are in direct contrast with previous reports suggesting that heteroepitaxial radial growth of III-antimonides is always favored on the ZB-structure facets, indicate that the growth of WZ-AlSb is preferred over the thermodynamically stable ZB-AlSb at lower growth temperatures. We attribute this behavior to kinetic limitations of MOVPE of AlSb on ZB and WZ phases of InAs.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
AlSb, aluminum antimonide, Core-shell nanowire, selective radial growth
in
Nano Letters
volume
18
issue
9
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:30133288
  • scopus:85053018950
ISSN
1530-6984
DOI
10.1021/acs.nanolett.8b02421
language
English
LU publication?
yes
id
2f0ff2ee-f3a4-4a19-820d-bb6a1a200f6d
date added to LUP
2018-10-11 10:47:14
date last changed
2020-10-20 01:25:50
@article{2f0ff2ee-f3a4-4a19-820d-bb6a1a200f6d,
  abstract     = {<p>Using AlSb as the model system, we demonstrate that kinetic limitations can lead to the preferential growth of wurtzite (WZ) AlSb shells rather than the thermodynamically stable zinc-blende (ZB) AlSb and that the WZ and ZB relative thickness can be tuned by a careful control of the deposition parameters. We report selective heteroepitaxial radial growth of AlSb deposited by metal-organic vapor phase epitaxy (MOVPE) on InAs nanowire core templates with engineered lengths of axial WZ and ZB segments. AlSb shell thickness, crystal phase, nanostructure, and composition are investigated as a function of the shell growth temperature, T<sub>s</sub>, using scanning electron microscopy, transmission electron microscopy, electron tomography, and energy-dispersive X-ray spectroscopy. We find that ZB- and WZ-structured AlSb shells grow heteroepitaxially around the ZB and WZ segments of the InAs core, respectively. Surprisingly, at 390 &lt; T<sub>s</sub> &lt; 450 °C, the WZ-AlSb shells are thicker than the ZB-AlSb shells, and their thickness increases with decreasing T<sub>s</sub>. In comparison, the ZB-AlSb shell thicknesses increase slightly with increasing T<sub>s</sub>. We find that the increased thickness of the WZ-AlSb shells is due to the formation and enhanced deposition on {112-0} facets rather than on the more commonly grown {101-0} sidewall facets. Overall, these results, which are in direct contrast with previous reports suggesting that heteroepitaxial radial growth of III-antimonides is always favored on the ZB-structure facets, indicate that the growth of WZ-AlSb is preferred over the thermodynamically stable ZB-AlSb at lower growth temperatures. We attribute this behavior to kinetic limitations of MOVPE of AlSb on ZB and WZ phases of InAs.</p>},
  author       = {Kindlund, Hanna and Zamani, Reza R. and Persson, Axel R. and Lehmann, Sebastian and Wallenberg, L. Reine and Dick, Kimberly A.},
  issn         = {1530-6984},
  language     = {eng},
  number       = {9},
  pages        = {5775--5781},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Nano Letters},
  title        = {Kinetic Engineering of Wurtzite and Zinc-Blende AlSb Shells on InAs Nanowires},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.8b02421},
  doi          = {10.1021/acs.nanolett.8b02421},
  volume       = {18},
  year         = {2018},
}