Nucleation and initial radius of self-catalyzed III-V nanowires

Nucleation and initial radius of self-catalyzed III-V nanowires

We treat theoretically the initial nucleation step of self-catalyzed III-V nanowires under simultaneously deposited group III and V vapor fluxes and with surface diffusion of a group III element. Our model is capable of describing the droplet size at which the very first nanowire monolayer nucleates...

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Bibliographic Details
Published in:Journal of crystal growth Vol. 459; pp. 194 - 197
Main Authors: Dubrovskii, V.G., Borie, S., Dagnet, T., Reynes, L., André, Y., Gil, E.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01-02-2017
Elsevier BV
Elsevier
Subjects:
A3. Growth modeling
A3. Nucleation
Arsenic
B1. Gallium droplets
B1. III-V nanowires
Condensed Matter
Engineering Sciences
Fluxes
Gallium
Growth models
Materials
Materials Science
Micro and nanotechnologies
Microelectronics
Nanowires
Nucleation
Physics
Surface diffusion
B1. III-V nanowires
B1. Gallium droplets
A3. Growth modeling
A3. Nucleation
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Summary:We treat theoretically the initial nucleation step of self-catalyzed III-V nanowires under simultaneously deposited group III and V vapor fluxes and with surface diffusion of a group III element. Our model is capable of describing the droplet size at which the very first nanowire monolayer nucleates depending on the element fluxes and surface temperature. This size determines the initial nanowire radius in growth techniques without pre-deposition of gallium. We show that useful self-catalyzed III-V nanowires can form only under the appropriately balanced V/III flux ratios and temperatures. Such balance is required to obtain nucleation from reasonably sized droplets that are neither too small under excessive arsenic flux nor too large in the arsenic-poor conditions. •A model is proposed to describe the nucleation step of self-catalyzed III-V nanowires.•The droplet size is obtained at which the very first nanowire monolayer nucleates.•This size determines the initial nanowire radius.•We show that useful nanowires form only under the balanced V/III ratios and temperatures.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2016.12.024