Catalyst Atoms in Nanowires

  • Author: Lisa-Marie Rauschendorfer
  • Published: 21 April 2013
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Nature/Nature Publishing Group
thumbnail image: Catalyst Atoms in Nanowires

The incorporation of impurities in nanowires during their growth alters their properties substantially. In the semiconductor industry this effect is used to enhance conductivity of silicon nanowires by doping them with aluminium. Recently it has been demonstrated that the use of Al as a catalyst during the growth of nanowires results in effective doping of the Si.

Oussama Moutanabbir, École Polytechnique de Montréal, Montréal, Canada, and colleagues used ultraviolet-laser-assisted atom-probe tomography to analyze Al-doped Si nanowires. They were able to compile a three-dimensional atom-by-atom mapping of individual nanowires. The amount of Al atoms found in the nanowires exceeds the equilibrium solid solubility by orders of magnitude. Moreover, the Al impurities are homogeneously distributed within the wire without forming any clusters. The authors discuss that this phenomenon is driven by a kinetic process on atomic scale: During the growth of the nanowire, the Al atoms get trapped in the Si before they reach their chemical equilibrium.

Control of this mechanism is, according to the authors, applicable to other semiconductors, offering the opportunity for new routes to catalytic assembly of nanowires with potentially adjustable properties.

Article Views: 4125

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH