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Palladium seeded GaAs nanowires

Published online by Cambridge University Press:  14 January 2016

Robert T. Hallberg*
Affiliation:
Solid State Physics, Lund University, 221 00 Lund, Sweden
Sebastian Lehmann
Affiliation:
Solid State Physics, Lund University, 221 00 Lund, Sweden
Maria E. Messing
Affiliation:
Solid State Physics, Lund University, 221 00 Lund, Sweden; and Synchrotron Radiation Research, Lund University, 211 00, Lund, Sweden
Kimberly A. Dick
Affiliation:
Solid State Physics, Lund University, 221 00 Lund, Sweden; and Centre for Analysis and Synthesis, Lund University, 221 00 Lund, Sweden
*
a) Address all correspondence to this author. e-mail: robert.hallberg@ftf.lth.se
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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 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.

Type
Invited Feature Paper
Copyright
Copyright © Materials Research Society 2016 

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References

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