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X-ray measurements of the strain and shape of dielectric/metallic wrap-gated InAs nanowires

Publiceringsår: 2009
Språk: Engelska
Publikation/Tidskrift/Serie: Applied Physics Letters
Volym: 94
Nummer: 13
Dokumenttyp: Artikel i tidskrift
Förlag: American Institute of Physics


Wrap-gate (111) InAs nanowires (NWs) were studied after HfO2 dielectric coating and Cr metallic deposition by a combination of grazing incidence x-ray techniques. In-plane and out-of-plane x-ray diffraction (crystal truncation rod analysis) allow determining the strain tensor. The longitudinal contraction, increasing with HfO2 and Cr deposition, is significantly larger than the radial dilatation. For the Cr coating, the contraction along the growth axis is quite large (-0.95%), and the longitudinal/radial deformation ratio is >10, which may play a role on the NW transport properties. Small angle x-ray scattering shows a smoothening of the initial hexagonal bare InAs NW shape and gives the respective core/shell thicknesses, which are compared to flat surface values.


  • Condensed Matter Physics
  • X-ray diffraction
  • nanotechnology
  • indium compounds
  • III-V semiconductors
  • compounds
  • hafnium
  • dielectric materials
  • deformation
  • chromium
  • coatings
  • semiconductor heterojunctions
  • nanowires


  • ISSN: 0003-6951

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