University of Oulu

Tyunina, M., Savinov, M., & Dejneka, A. (2021). Electrical conductivity in oxygen-substituted SrTiO 3-δ films. Applied Physics Letters, 119(19), 192901.

Electrical conductivity in oxygen-substituted SrTiO3-δ films

Saved in:
Author: Tyunina, M.1,2; Savinov, M.2; Dejneka, A.2
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
Persistent link:
Language: English
Published: American Institute of Physics, 2021
Publish Date: 2022-02-08


Enhancement of electrical conductivity in fundamentally insulating ABO₃ perovskite oxide ferroelectrics is crucial for innovative applications in resistive switching, photovoltaics, and catalysis. One of the methods to raise conductivity in bulk crystals or ceramics relies on the possibility to remove and/or substitute oxygen atoms. Here, we explored this approach for thin films of the representative perovskite oxide SrTiO₃. Small-signal AC conductivity was investigated in epitaxial and polycrystalline films, where oxygen vacancies (Vₒ), nitrogen (N), or hydrogen (H) were introduced in situ during film growth. Hopping mechanism of conductivity was evidenced by the observed strong growth of AC conductivity with temperature, frequency, and AC voltage in all films. Small polarons were identified as charge carriers. Oxygen vacancies/substitutions were suggested to facilitate hopping probability by generating sites for carrier localization. Important ferroelectric devices were proposed to benefit from the revealed hopping conductivity owing to its unique increase with an electric field.

see all

Series: Applied physics letters
ISSN: 0003-6951
ISSN-E: 0003-6951
ISSN-L: 0003-6951
Volume: 119
Article number: 192901
DOI: 10.1063/5.0072225
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
213 Electronic, automation and communications engineering, electronics
Funding: The authors acknowledge support from the Czech Science Foundation (Grant No. 19-09671S) and the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760).
Copyright information: © 2021 AIP Publishing. The final authenticated version is available online at