Modulation of rectifying behaviour by oxygen contents in La 0.5Sr0.5CoO3-δ/0.7 wt% Nb-doped SrTiO3 heterojunctions

G. Li, Y. P. Yao, Y. Hou, T. F. Zhou, X. G. Lee

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Heterojunctions composed of La0.5Sr0.5CoO 3-δ and 0.7 wt% Nb-doped SrTiO3 were deposited at different oxygen partial pressures and display opposite rectifying shapes: the junctions fabricated at a lower oxygen pressure show a backward shape and they gradually display a forward shape by tuning up the oxygen partial pressures. The former tends to form degenerate p-n junctions due to oxygen deficiency, which is responsible for the backward rectifying shape. The latter, however, can be viewed as a Schottky-type diode. The oxygen contents for the junctions can be estimated from their x-ray diffraction patterns, and are also confirmed from their resistance and magnetization measurements.

Original languageEnglish (US)
Article number065006
JournalJournal of Physics D: Applied Physics
Issue number6
StatePublished - Apr 8 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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