High-resolution detection of Au catalyst atoms in Si nanowires

Jonathan E. Allen, Eric R. Hemesath, Daniel E. Perea, Jessica L. Lensch-Falk, Z. Y. Li, Feng Yin, Mhairi H. Gass, Peng Wang, Andrew L. Bleloch, Richard E. Palmer, Lincoln J. Lauhon

Research output: Contribution to journalArticlepeer-review

519 Scopus citations

Abstract

The potential for the metal nanocatalyst to contaminate vapour-liquid-solid grown semiconductor nanowires has been a long-standing concern, because the most common catalyst material, Au, is highly detrimental to the performance of minority carrier electronic devices. We have detected single Au atoms in Si nanowires grown using Au nanocatalyst particles in a vapour-liquid-solid process. Using high-angle annular dark-field scanning transmission electron microscopy, Au atoms were observed in higher numbers than expected from a simple extrapolation of the bulk solubility to the low growth temperature. Direct measurements of the minority carrier diffusion length versus nanowire diameter, however, demonstrate that surface recombination controls minority carrier transport in as-grown n-type nanowires; the influence of Au is negligible. These results advance the quantitative correlation of atomic-scale structure with the properties of nanomaterials and can provide essential guidance to the development of nanowire-based device technologies.

Original languageEnglish (US)
Pages (from-to)168-173
Number of pages6
JournalNature nanotechnology
Volume3
Issue number3
DOIs
StatePublished - Mar 2008

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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