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In situ observations of size effects in GaAs nanowire growth

Marnauza, Mikelis LU orcid ; Tornberg, Marcus LU ; Mårtensson, Erik K. LU ; Jacobsson, Daniel LU and Dick, Kimberly A. LU (2022) In Nanoscale Horizons 8(2). p.291-296
Abstract

Lateral dimensions of III-V nanowires are known to affect the growth dynamics and crystal structure. Investigations into size effects have in the past relied on theoretical models and post growth observations, which only give a limited insight into the growth dynamics. Here we show the first experimental investigation into how nanowire diameter affects the growth dynamics by growing Au-seeded GaAs nanowires in an environmental transmission electron microscope. This was done by recording videos of nanowires during growth and analysing the Ga-limited incubation time and As-limited step-flow time. Our data show that the incubation time is stable across the investigated diameter range aside from a sharp increase for the smallest diameter,... (More)

Lateral dimensions of III-V nanowires are known to affect the growth dynamics and crystal structure. Investigations into size effects have in the past relied on theoretical models and post growth observations, which only give a limited insight into the growth dynamics. Here we show the first experimental investigation into how nanowire diameter affects the growth dynamics by growing Au-seeded GaAs nanowires in an environmental transmission electron microscope. This was done by recording videos of nanowires during growth and analysing the Ga-limited incubation time and As-limited step-flow time. Our data show that the incubation time is stable across the investigated diameter range aside from a sharp increase for the smallest diameter, whereas the step-flow time is observed to steadily increase across the diameter range. We show using a simple model that this can be explained by the increasing vapour pressure in the droplet. In addition to the existing understanding of nanowire growth at small dimensions being limited by nucleation this work provides experimental evidence that growth is also limited by the inability to finish the step-flow process.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale Horizons
volume
8
issue
2
pages
6 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:36621012
  • scopus:85146165679
ISSN
2055-6756
DOI
10.1039/d2nh00432a
language
English
LU publication?
yes
id
c312cabe-aebf-4880-9a68-28e1994003c2
date added to LUP
2023-02-16 09:45:53
date last changed
2024-04-14 04:47:04
@article{c312cabe-aebf-4880-9a68-28e1994003c2,
  abstract     = {{<p>Lateral dimensions of III-V nanowires are known to affect the growth dynamics and crystal structure. Investigations into size effects have in the past relied on theoretical models and post growth observations, which only give a limited insight into the growth dynamics. Here we show the first experimental investigation into how nanowire diameter affects the growth dynamics by growing Au-seeded GaAs nanowires in an environmental transmission electron microscope. This was done by recording videos of nanowires during growth and analysing the Ga-limited incubation time and As-limited step-flow time. Our data show that the incubation time is stable across the investigated diameter range aside from a sharp increase for the smallest diameter, whereas the step-flow time is observed to steadily increase across the diameter range. We show using a simple model that this can be explained by the increasing vapour pressure in the droplet. In addition to the existing understanding of nanowire growth at small dimensions being limited by nucleation this work provides experimental evidence that growth is also limited by the inability to finish the step-flow process.</p>}},
  author       = {{Marnauza, Mikelis and Tornberg, Marcus and Mårtensson, Erik K. and Jacobsson, Daniel and Dick, Kimberly A.}},
  issn         = {{2055-6756}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{291--296}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Nanoscale Horizons}},
  title        = {{In situ observations of size effects in GaAs nanowire growth}},
  url          = {{http://dx.doi.org/10.1039/d2nh00432a}},
  doi          = {{10.1039/d2nh00432a}},
  volume       = {{8}},
  year         = {{2022}},
}