Barrier heights at the SnO2/Pt interface: In situ photoemission and electrical properties

Christoph Körber, Steven P. Harvey, Thomas O. Mason, Andreas Klein

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The SnO2/Pt contact has been investigated using in situ photoelectron spectroscopy and electrical 2-point and 4-point conductivity measurements. A remarkable increase of barrier height from 0.4 eV to 0.9 eV is observed after annealing the as-deposited contact in 0.5 Pa oxygen atmosphere. Subsequent annealing in vacuum reduces the barrier height again. Despite the expected large barrier height, the current-voltage characteristics displays ohmic behavior. The discrepancy between photoemission and electrical behavior is attributed to the polycrystalline nature of the SnO2 film used in this study, leading to an inhomogeneous Schottky barrier height along the surface of polycrystalline specimens.

Original languageEnglish
Pages (from-to)3246-3252
Number of pages7
JournalSurface Science
Volume602
Issue number21
DOIs
Publication statusPublished - Nov 1 2008

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Keywords

  • Electrical transport measurement
  • Photoelectron spectroscopy
  • Platinum
  • Schottky barrier
  • Tin oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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