Temperature Dependent Polarity Reversal in Au/Nb:SrTiO3 Schottky Junctions

Abstract

We have observed temperature-dependent reversal of the rectifying polarity in Au/Nb:SrTiO3 Schottky junctions. By simulating current-voltage characteristics we have found that the permittivity of SrTiO3 near the interface exhibits temperature dependence opposite to that observed in the bulk, significantly reducing the barrier width. At low temperature, tunneling current dominates the junction transport due both to such barrier narrowing and to suppressed thermal excitations. The present results demonstrate that novel junction properties can be induced by the interface permittivity.

References in corpus (3)

• Lattice relaxation, electronic screening, and spin and orbital phase diagram of LaTiO${}_3$/SrTiO${}_3$ superlattices
• Lattice polarization effects on electron-gas charge densities in ionic superlattices
• Low temperature metallic state induced by electrostatic carrier doping of SrTiO${}_3$

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