Role of step edges in oxygen vacancy transport into SrTiO 3(001)

X. D. Zhu, Y. Y. Fei, H. B. Lu, G. Z. Yang

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16 Scopus citations


Using a combination of oblique-incidence optical reflectivity difference and specular reflection high energy electron diffraction techniques, we studied vacuum annealing of pulsed-laser deposited Nb-doped SrTiO 3 monolayers on SrTiO 3(100) near 730 °C. In oxygen-free ambient, the as-grown monolayers are oxygen deficient. The excess oxygen vacancies in the monolayers are reduced by vacancy diffusion into the bulk. We found that the reduction rate is characterized by an activation energy E=1.0 eV. More interestingly, the pre-exponential factor decreases significantly as the annealing time interval increases between two successive monolayer depositions. We propose that the indiffusion of excess surface oxygen vacancies takes place at step edges, and the Oswald ripening governs the density of the latter during vacuum annealing.

Original languageEnglish (US)
Article number051903
JournalApplied Physics Letters
Issue number5
StatePublished - 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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