Unusual Electrical Transport Characteristic of the SrSnO3/Nb-Doped SrTiO3 Heterostructure

De-Peng Wang; Rui-Feng Niu; Li-Qi Cui; Wei-Tian Wang

doi:10.3740/MRSK.2023.33.6.229

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2023 Vol.33, Issue 6 Next Page

Research Paper

Unusual Electrical Transport Characteristic of the SrSnO₃/Nb-Doped SrTiO₃ Heterostructure

27 June 2023. pp. 229-235

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Abstract

An all-perovskite oxide heterostructure composed of SrSnO₃/Nb-doped SrTiO₃ was fabricated using the pulsed laser deposition method. In-plane and out-of-plane structural characterization of the fabricated films were analyzed by x-ray diffraction with θ-2θ scans and φ scans. X-ray photoelectron spectroscopy measurement was performed to check the film’s composition. The electrical transport characteristic of the heterostructure was determined by applying a pulsed dc bias across the interface. Unusual transport properties of the interface between the SrSnO₃ and Nb-doped SrTiO₃ were investigated at temperatures from 100 to 300 K. A diodelike rectifying behavior was observed in the temperature-dependent current-voltage (IV) measurements. The forward current showed the typical IV characteristics of p-n junctions or Schottky diodes, and were perfectly fitted using the thermionic emission model. Two regions with different transport mechanism were detected, and the boundary curve was expressed by ln I = -1.28V - 13. Under reverse bias, however, the temperature- dependent IV curves revealed an unusual increase in the reverse-bias current with decreasing temperature, indicating tunneling effects at the interface. The Poole-Frenkel emission was used to explain this electrical transport mechanism under the reverse voltages.

Keywords

perovskite thin films

semiconductor-metal junctions

transport properties

pulsed laser deposition

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :6
Pages :229-235
Received Date : 2023-03-16
Revised Date : 2023-05-24
Accepted Date : 2023-05-24
DOI :https://doi.org/10.3740/MRSK.2023.33.6.229

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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