Kinetic Model of the Initial Stage of the Nanowire Growth

A kinetic model of the formation of pyramid-like bulges (pedestals) at the bases of vertical nanowires is proposed. The formation of the pedestals at the early stage of the nanowire growth is assumed to be induced by a higher nucleation rate of two-dimensional islands under the catalyst droplet, as...

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Bibliographic Details
Published in:Russian physics journal 2018-03, Vol.60 (11), p.2040-2043
Main Authors: Filimonov, S. N., Hervieu, Yu. Yu
Format: Article
Language:English
Subjects:
Adatoms
Catalysis
Catalysts
Comparative analysis
Condensed Matter Physics
Epitaxy
Hadrons
Heavy Ions
Kinetics
Lasers
Mathematical and Computational Physics
Nanowires
Nuclear Physics
Nucleation
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Reaction kinetics
Theoretical
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Summary:A kinetic model of the formation of pyramid-like bulges (pedestals) at the bases of vertical nanowires is proposed. The formation of the pedestals at the early stage of the nanowire growth is assumed to be induced by a higher nucleation rate of two-dimensional islands under the catalyst droplet, as compared to the nucleation rate at the non-activated surface areas. Kinetics of the nucleation and propagation of the steps in the pyramid is described with a model of the multilayer growth, taking into account that the catalyst droplet at the nanowire top is a strong sink for adatoms. It is shown that the transition from the growth of the pyramid to the axial growth of the nanowire is possible if the appearance of a nucleus of the new layer under the catalyst droplet results in a partial dissolution of the underlying layer. In this case a segment of the nanowire sidewall is formed, preventing the lateral growth of the layers generated by the droplet.
ISSN:1064-8887
1573-9228
DOI:10.1007/s11182-018-1322-9