Modulation of rectifying behaviour by oxygen contents in La0.5Sr0.5CoO3-δ/0.7 wt% Nb-doped SrTiO3 heterojunctions
Abstract
Heterojunctions composed of La0.5Sr0.5CoO3-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.
- Publication:
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Journal of Physics D Applied Physics
- Pub Date:
- March 2009
- DOI:
- 10.1088/0022-3727/42/6/065006
- Bibcode:
- 2009JPhD...42f5006L