Surface photovoltage spectroscopy study of reduced and oxidized nanocrystalline TiO2 films

A. Rothschild, A. Levakov, Y. Shapira, N. Ashkenasy, Y. Komem

Research output: Contribution to journalConference articlepeer-review

61 Scopus citations

Abstract

Nanocrystalline TiO2 films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature gas sensors.

Original languageEnglish
Pages (from-to)456-460
Number of pages5
JournalSurface Science
Volume532-535
DOIs
StatePublished - 10 Jun 2003
Externally publishedYes
EventProceedings of the 7th International Conference on Nanometer - Malmo, Sweden
Duration: 29 Aug 200231 Aug 2002

Keywords

  • Chemisorption
  • Interface states
  • Polycrystalline thin films
  • Surface electronic phenomena (work function, surface potential, surface states, etc.)
  • Surface photovoltage
  • Titanium oxide

ASJC Scopus subject areas

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

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