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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Surface morphology of Au-free grown nanowires after native oxide removal.

Author

  • Martin Hjort
  • Johan Knutsson
  • Bernhard Mandl
  • Knut Deppert
  • Edvin Lundgren
  • Rainer Timm
  • Anders Mikkelsen

Summary, in English

Using scanning tunneling microscopy, we evaluate the surface structure and morphology down to the atomic scale for micrometers along Au-free grown InAs nanowires (NWs) free from native oxide. We find that removal of the native oxide (which covers the NWs upon exposure to the ambient air) using atomic hydrogen does not alter the underlying step structure. Imaging with sub-nanometer resolution along the NWs, we find an extremely low tapering (diameter change along the NW) of 1.7 ± 0.5 Åμm(-1). A surface morphology with monolayer high islands, whose shape was influenced by stacking faults, was found to cover the NWs and was attributed to the decomposed native oxide. The appearance of point defects in the form of As-vacancies at the surface is analyzed and we set limits to the amount of carbon impurities in the NWs.

Department/s

  • Synchrotron Radiation Research
  • Solid State Physics
  • NanoLund

Publishing year

2015

Language

English

Pages

9998-10004

Publication/Series

Nanoscale

Volume

7

Issue

22

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Nano Technology

Status

Published

ISBN/ISSN/Other

  • ISSN: 2040-3372