New Journal of Physics (Jan 2013)

The SrTiO3/BiFeO3 (001) interface: commutativity of energy band discontinuities

  • R Schafranek,
  • J D Baniecki,
  • M Ishii,
  • Y Kotaka,
  • K Kurihara

DOI
https://doi.org/10.1088/1367-2630/15/5/053014
Journal volume & issue
Vol. 15, no. 5
p. 053014

Abstract

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The interface formation between the perovskite oxides SrTiO _3 and BiFeO _3 was studied using in situ photoelectron spectroscopy by depositing BiFeO _3 on SrTiO _3 and vice versa via pulsed laser deposition. For the interfaces characterized, a type II band alignment with a valence band offset of 0.9–1.0 eV and a conduction band offset of 0.5–0.6 eV was observed. Within the margin of error the commutativity was fulfilled for the SrTiO _3 /BiFeO _3 interface, meaning that the band alignment does not depend on the deposition sequence.