Non-linear electric field response of permittivity of atomically smooth TiO2(rutile) single crystals studied by an electrochemical approach

Shintaro Takata, Atsushi Hachiya, Yuji Matsumoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Electric field-dependent permittivity of n-TiO2 (rutile) along different crystallographic axes was investigated by an electrochemical impedance spectroscopy (EIS) measurement. The C-2 versus U plots were fitted with a quadratic function of U, derived from a model that adds the effects of electric field dependent permittivity to the conventional Mott-Schottky equation. Only when atomically flat n-TiO2 single crystal electrodes were used, could the intrinsic behavior of the electric field dependent permittivity be observed. The principal components of permittivity in the ab-plane exhibited a weak electric field dependence, while a strong electric field dependence was confirmed along the c-axis direction. By taking the electric field dependent permittivity into account, we were able to evaluate accurately the flat-band potential and the donor density. Different photocurrent behavior between (110), (100), and (001) electrodes is discussed in terms of the electric field strength at the surface and the depletion layer width within TiO2.

Original languageEnglish
Pages (from-to)366-369
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume120
Issue number1405
DOIs
Publication statusPublished - 2012 Sep
Externally publishedYes

Keywords

  • Electric field dependent permittivity
  • Electrochemistry
  • Impedance analysis
  • Photocurrent
  • Single crystal
  • Titanium dioxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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