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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Growth of GaP nanotree structures by sequential seeding of 1D nanowires

Author

  • Kimberly Dick Thelander
  • Knut Deppert
  • Thomas Mårtensson
  • Werner Seifert
  • Lars Samuelson

Summary, in English

Complex nanostructures are becoming increasingly important for the development of nanoscale devices and functional nanomaterials. Precise control of size and morphology of these structures is critical to their fabrication and exploitation. We have developed a method for stepwise growth of tree-like nanostructures via the vapour liquid-solid (VLS) growth mode, demonstrated for III-V semiconductor materials. This method uses the initial seeding of nanowires by catalytic aerosol nanoparticles to form the trunk, followed by sequential seeding of branching structures. Here we present a detailed study of the growth of these complex structures using Gap. Diameter of each level of nanowires is directly determined by seed particle diameters, and number of branches is determined by seed particle density. Growth rate is shown to increase with temperature to a maximum corresponding to the temperature of complete decomposition of the Group-III precursor material, and subsequently decrease due to competition with bulk growth. Growth rate also depends on flow of the Group-III precursor, but not on the Group-V precursor. Finally, there is a relationship between the number of branches and their growth rate, suggesting that material diffusion plays a role in nanowire branch growth. (C) 2004 Elsevier B.V. All rights reserved.

Department/s

  • Solid State Physics

Publishing year

2004

Language

English

Pages

131-137

Publication/Series

Journal of Crystal Growth

Volume

272

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Condensed Matter Physics

Keywords

  • semiconducting III-V
  • structures
  • metalorganic vapor phase epitaxy
  • materials

Status

Published

ISBN/ISSN/Other

  • ISSN: 0022-0248