Temperature-dependent Poole-Frenkel transport properties of the SrSnO3/Nb-doped SrTiO3 heterostructure

All-perovskite oxide heterostructure of SrSnO3/Nb-doped SrTiO3 was fabricated by using the pulsed laser deposition method. Unusual transport properties of the interface between SrSnO3 and Nb-doped SrTiO3 have been investigated at temperatures from 100 to 300 K. A diodelike rectifying behavior has been demonstrated by the temperature-dependent current-voltage (IV) measurements. The forward current showed typical IV characteristics of p-n junctions or Schottky diodes and was perfectly fitted using the thermionic emission model. At the reverse bias, however, the temperature-dependent IV curves developed in the opposite direction, indicating the tunneling effects on the interface. The Poole-Frenkel emission was used to explain this electrical transport mechanism under the reverse voltages.

Automated summary

All-perovskite oxide heterostructure of SrSnO3/Nb-doped SrTiO3 was fabricated and investigated for its unusual transport properties. Diodelike rectifying behavior was observed in the forward current while the temperature-dependent IV curves showed tunneling effects in the reverse bias. The electrical transport mechanism was explained using the thermionic emission model and the Poole-Frenkel emission.