Article ID Journal Published Year Pages File Type
1789644 Journal of Crystal Growth 2016 7 Pages PDF
Abstract

•Analytical approach is proposed for describing the VLS growth of III–V nanowires.•The transition from transport to nucleation limited VLS growth is demonstrated.•Radial growth or self-equilibration in Ga-catalyzed GaAs nanowires is investigated.•The model correlates well with recent experimental findings and numerical models.

We present a new theoretical model that treats the group V sensitive growth rates and structures of Au-catalyzed and self-catalyzed III–V nanowires within a single kinetic picture. It is shown that Au-catalyzed III–V nanowires can grow with a time-independent radius within a wide range of parameters. At high V/III flux ratios, the vapor–liquid–solid growth of Au catalyzed III–V nanowires is controlled by surface diffusion of the group III adatoms, while at low V/III flux ratios it becomes nucleation-limited. Conversely, self-catalyzed III–V nanowires cannot grow with a time-independent droplet size and instead such nanowires may either swell or shrink or converge to a certain stationary radius depending on the V/III flux ratio. Quite importantly, the results are presented in a concise analytical form which is convenient for comparison with experimental data or prior theoretical works. We demonstrate how the model fits the data obtained previously for Au- and Ga-catalyzed GaAs nanowires.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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