Oxygen vacancy migration and dispersive photoconductivity in Bi 4Ti3O12-d

Minoru Osada, Masaru Tada, Masato Kakihana, Yuji Noguchi, Masaru Mlyayama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We investigated the influence of photoexcited nonequilibrium. electrons in Bi4Ti3O12-d which contains a high density of oxygen vacancies. With increasing oxygen deficiency, the photocurrent undergoes a rapid enhancement, accompanied by a marked change in kinetics. In heavily oxygen-deficient Bi4Ti3O12-d (d = 0.45), we observed a nonexponential relaxation of. photogenerated carriers with an increasingly slow decay after termination of visible illumination with energy lower than the band gap. This phenomenon is similar to what has been reported for persistent photoconductivity effects in the layered perovskite YBa 2Cu3O7_d and Nd2Ti3O 9, both of which resulted from the space charge field established by photoexcited electrons trapped at oxygen vacancies. We argue that oxygen vacancies acting as trapping centers for electrons are linked to dispersive diffusion in the perovskite blocks, which control carrier recombination.

Original languageEnglish
Pages (from-to)6649-6652
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number9 B
DOIs
Publication statusPublished - 2004 Sep
Externally publishedYes

Keywords

  • Bi-based ferroelectrics
  • Dispersive photoconductivity
  • Oxygen vacancy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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