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Mechanism of periodic height variations along self-aligned VLS-grown planar nanostructures

Journal Article


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Abstract


  • In this study we report in-plane nanotracks produced by molecular-beam-epitaxy (MBE) exhibiting lateral

    self-assembly and unusual periodic and out-of-phase height variations across their growth axes. The

    nanotracks are synthesized using bismuth segregation on the GaAsBi epitaxial surface, which results in

    metallic liquid droplets capable of catalyzing GaAsBi nanotrack growth via the vapor–liquid–solid (VLS)

    mechanism. A detailed examination of the nanotrack morphologies is carried out employing a combination

    of scanning electron and atomic force microscopy and, based on the findings, a geometric model

    of nanotrack growth during MBE is developed. Our results indicate diffusion and shadowing effects play

    significant roles in defining the interesting nanotrack shape. The unique periodicity of our lateral nanotracks

    originates from a rotating nucleation “hot spot” at the edge of the liquid–solid interface, a feature

    caused by the relative periodic circling of the non-normal ion beam flux incident on the sample surface,

    inside the MBE chamber. We point out that such a concept is divergent from current models of crawling

    mode growth kinetics and conclude that these effects may be utilized in the design and assembly of

    planar nanostructures with controlled non-monotonous structure

Authors


  •   Steele, Julian
  •   Horvat, Josip
  •   Lewis, R A.
  •   Henini, M (external author)
  •   Fan, D. (external author)
  •   Mazur, Yu. I. (external author)
  •   Dorogan, V G. (external author)
  •   Grant, P C. (external author)
  •   Yu, S.-Q (external author)
  •   Salamo, G J. (external author)

Publication Date


  • 2015

Citation


  • Steele, J. A., Horvat, J., Lewis, R. A., Henini, M., Fan, D., Mazur, Y. I., Dorogan, V. G., Grant, P. C., Yu, S., Salamo, G. J. et al (2015). Mechanism of periodic height variations along self-aligned VLS-grown planar nanostructures. Nanoscale, 7 (48), 20442-20450.

Scopus Eid


  • 2-s2.0-84949024460

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2661&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1659

Number Of Pages


  • 8

Start Page


  • 20442

End Page


  • 20450

Volume


  • 7

Issue


  • 48

Abstract


  • In this study we report in-plane nanotracks produced by molecular-beam-epitaxy (MBE) exhibiting lateral

    self-assembly and unusual periodic and out-of-phase height variations across their growth axes. The

    nanotracks are synthesized using bismuth segregation on the GaAsBi epitaxial surface, which results in

    metallic liquid droplets capable of catalyzing GaAsBi nanotrack growth via the vapor–liquid–solid (VLS)

    mechanism. A detailed examination of the nanotrack morphologies is carried out employing a combination

    of scanning electron and atomic force microscopy and, based on the findings, a geometric model

    of nanotrack growth during MBE is developed. Our results indicate diffusion and shadowing effects play

    significant roles in defining the interesting nanotrack shape. The unique periodicity of our lateral nanotracks

    originates from a rotating nucleation “hot spot” at the edge of the liquid–solid interface, a feature

    caused by the relative periodic circling of the non-normal ion beam flux incident on the sample surface,

    inside the MBE chamber. We point out that such a concept is divergent from current models of crawling

    mode growth kinetics and conclude that these effects may be utilized in the design and assembly of

    planar nanostructures with controlled non-monotonous structure

Authors


  •   Steele, Julian
  •   Horvat, Josip
  •   Lewis, R A.
  •   Henini, M (external author)
  •   Fan, D. (external author)
  •   Mazur, Yu. I. (external author)
  •   Dorogan, V G. (external author)
  •   Grant, P C. (external author)
  •   Yu, S.-Q (external author)
  •   Salamo, G J. (external author)

Publication Date


  • 2015

Citation


  • Steele, J. A., Horvat, J., Lewis, R. A., Henini, M., Fan, D., Mazur, Y. I., Dorogan, V. G., Grant, P. C., Yu, S., Salamo, G. J. et al (2015). Mechanism of periodic height variations along self-aligned VLS-grown planar nanostructures. Nanoscale, 7 (48), 20442-20450.

Scopus Eid


  • 2-s2.0-84949024460

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2661&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1659

Number Of Pages


  • 8

Start Page


  • 20442

End Page


  • 20450

Volume


  • 7

Issue


  • 48