Jump to main content
Jump to site search


Impact of the Ga flux incidence angle on the growth kinetics of self-assisted GaAs nanowires on Si(111)

Author affiliations

Abstract

In this work we show that the incidence angle of group-III element fluxes plays a significant role in the diffusion-controlled growth of III–V nanowires (NWs) by molecular beam epitaxy (MBE). We present a thorough experimental study on the self-assisted growth of GaAs NWs by using a MBE reactor equipped with two Ga cells located at different incidence angles with respect to the surface normal of the substrate, so as to ascertain the impact of such a parameter on the NW growth kinetics. The as-obtained results show a dramatic influence of the Ga flux incidence angle on the NW length and diameter, as well as on the shape and size of the Ga droplets acting as catalysts. In order to interpret the results we developed a semi-empirical analytical model inspired by those already developed for MBE-grown Au-catalyzed GaAs NWs. Numerical simulations performed with the model allow us to reproduce thoroughly the experimental results (in terms of NW length and diameter and of droplet size and wetting angle), putting in evidence that under formally the same experimental conditions the incidence angle of the Ga flux is a key parameter which can drastically affect the growth kinetics of the NWs grown by MBE.

Graphical abstract: Impact of the Ga flux incidence angle on the growth kinetics of self-assisted GaAs nanowires on Si(111)

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Jul 2019, accepted on 06 Oct 2019 and first published on 07 Oct 2019


Article type: Paper
DOI: 10.1039/C9NA00443B
Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Impact of the Ga flux incidence angle on the growth kinetics of self-assisted GaAs nanowires on Si(111)

    M. Vettori, A. Danescu, X. Guan, P. Regreny, J. Penuelas and M. Gendry, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C9NA00443B

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements