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Palladium seeded GaAs nanowires

Hallberg, Robert T. LU ; Lehmann, Sebastian LU ; Messing, Maria E. LU and Dick Thelander, Kimberly LU (2016) In Journal of Materials Research 31(2). p.175-185
Abstract

In this work, we present a detailed investigation of the growth of palladium-seeded GaAs nanowires. Nanowires grown on GaAs (111)B substrates consist of three different morphologies, denoted as curly (containing multiple kinks), inclined (relative to the substrate, such as 〈001〉), and vertical. We show that the relative yield of the different types is controllable by a combination of V/III ratio and temperature, where vertical and inclined nanowires are promoted by a high temperature and low V/III ratio. These growth conditions are expected to promote a higher Ga incorporation into the Pd particle, which is confirmed by energy dispersive x-ray analysis. We propose that the observed relationship between particle composition and nanowire... (More)

In this work, we present a detailed investigation of the growth of palladium-seeded GaAs nanowires. Nanowires grown on GaAs (111)B substrates consist of three different morphologies, denoted as curly (containing multiple kinks), inclined (relative to the substrate, such as 〈001〉), and vertical. We show that the relative yield of the different types is controllable by a combination of V/III ratio and temperature, where vertical and inclined nanowires are promoted by a high temperature and low V/III ratio. These growth conditions are expected to promote a higher Ga incorporation into the Pd particle, which is confirmed by energy dispersive x-ray analysis. We propose that the observed relationship between particle composition and nanowire morphology may be related to the particle phase, with liquid particles promoting straight nanowire growth. In addition, particles at the tips of nanowires are sometimes observed to be smaller than the initial particle size, suggesting that Pd has been lost during the growth process. Finally, we demonstrate the importance of initial particle size-control to interpret diameter changes after growth.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
III–V, metalorganic deposition, Pd
in
Journal of Materials Research
volume
31
issue
2
pages
175 - 185
publisher
Materials Research Society
external identifiers
  • Scopus:84961286106
  • WOS:000371704900001
ISSN
0884-2914
DOI
10.1557/jmr.2015.400
language
English
LU publication?
yes
id
92aea855-6070-472a-8757-3df39c016dc6
date added to LUP
2016-04-22 11:16:25
date last changed
2016-09-22 07:26:20
@misc{92aea855-6070-472a-8757-3df39c016dc6,
  abstract     = {<p>In this work, we present a detailed investigation of the growth of palladium-seeded GaAs nanowires. Nanowires grown on GaAs (111)B substrates consist of three different morphologies, denoted as curly (containing multiple kinks), inclined (relative to the substrate, such as 〈001〉), and vertical. We show that the relative yield of the different types is controllable by a combination of V/III ratio and temperature, where vertical and inclined nanowires are promoted by a high temperature and low V/III ratio. These growth conditions are expected to promote a higher Ga incorporation into the Pd particle, which is confirmed by energy dispersive x-ray analysis. We propose that the observed relationship between particle composition and nanowire morphology may be related to the particle phase, with liquid particles promoting straight nanowire growth. In addition, particles at the tips of nanowires are sometimes observed to be smaller than the initial particle size, suggesting that Pd has been lost during the growth process. Finally, we demonstrate the importance of initial particle size-control to interpret diameter changes after growth.</p>},
  author       = {Hallberg, Robert T. and Lehmann, Sebastian and Messing, Maria E. and Dick Thelander, Kimberly},
  issn         = {0884-2914},
  keyword      = {III–V,metalorganic deposition,Pd},
  language     = {eng},
  number       = {2},
  pages        = {175--185},
  publisher    = {ARRAY(0xaee7288)},
  series       = {Journal of Materials Research},
  title        = {Palladium seeded GaAs nanowires},
  url          = {http://dx.doi.org/10.1557/jmr.2015.400},
  volume       = {31},
  year         = {2016},
}