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Bulk and surface characterization of In2O3(001) single crystals

Författare:
  • Daniel R. Hagleitner
  • Manfred Menhart
  • Peter Jacobson
  • Sara Blomberg
  • Karina Schulte
  • Edvin Lundgren
  • Markus Kubicek
  • Juergen Fleig
  • Frank Kubel
  • Christoph Puls
  • Andreas Limbeck
  • Herbert Hutter
  • Lynn A. Boatner
  • Michael Schmid
  • Ulrike Diebold
Publiceringsår: 2012
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review B (Condensed Matter and Materials Physics)
Volym: 85
Nummer: 11
Dokumenttyp: Artikel i tidskrift
Förlag: American Physical Society

Sammanfattning

A comprehensive bulk and surface investigation of high-quality In2O3(001) single crystals is reported. The transparent-yellow, cube-shaped single crystals were grown using the flux method. Inductively coupled plasma mass spectrometry (ICP-MS) reveals small residues of Pb, Mg, and Pt in the crystals. Four-point-probe measurements show a resistivity of 2.0 +/- 0.5 x 10(5) Omega cm, which translates into a carrier concentration of approximate to 10(12) cm(-3). The results from x-ray diffraction (XRD) measurements revise the lattice constant to 10.1150(5) angstrom from the previously accepted value of 10.117 angstrom. Scanning tunneling microscopy (STM) images of a reduced (sputtered/annealed) and oxidized (exposure to atomic oxygen at 300 degrees C) surface show a step height of 5 angstrom, which indicates a preference for one type of surface termination. The surfaces stay flat without any evidence for macroscopic faceting under any of these preparation conditions. A combination of low-energy ion scattering (LEIS) and atomically resolved STM indicates an indium-terminated surface with small islands of 2.5 angstrom height under reducing conditions, with a surface structure corresponding to a strongly distorted indium lattice. Scanning tunneling spectroscopy (STS) reveals a pronounced surface state at the Fermi level (E-F). Photoelectron spectroscopy (PES) shows additional, deep-lying band gap states, which can be removed by exposure of the surface to atomic oxygen. Oxidation also results in a shoulder at the O 1s core level at a higher binding energy, possibly indicative of a surface peroxide species. A downward band bending of 0.4 eV is observed for the reduced surface, while the band bending of the oxidized surface is of the order of 0.1 eV or less.

Nyckelord

  • Physical Sciences
  • Atom and Molecular Physics and Optics
  • Natural Sciences

Övriga

Published
  • ISSN: 1098-0121

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