Modification of the Schottky barrier height at the RuO2 cathode during resistance degradation of Fe-doped SrTiO3

Ruth Giesecke, Ramis Hertwig, Thorsten J.M. Bayer, Clive A. Randall, Andreas Klein

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Abstract

The long-term stability of electronic devices at high temperatures and electric fields might be strongly influenced by the electronic properties of interfaces. A modification of Schottky barrier heights at electrode interfaces of functional oxides upon changes of the external oxygen partial pressure is well documented in literature. In this work, an experimental approach using X-ray photoelectron spectroscopy is presented, which enables to study transient changes in the Schottky barrier height induced by electrical degradation. A rise of the Fermi level at the RuO2 cathode interface of Fe-doped SrTiO3 single crystals by 0.6 eV is observed in the course of resistance degradation. The change of the effective barrier height is associated to the migration of oxygen vacancies towards the cathode and accompanied by the observed reduction of Ti. Different scenarios are discussed to explain the origin of barrier modification and the localization of the reduced Ti.

Original languageEnglish (US)
Pages (from-to)4590-4601
Number of pages12
JournalJournal of the American Ceramic Society
Volume100
Issue number10
DOIs
StatePublished - Oct 2017

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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