Electrical conductivity in oxygen-substituted SrTiO.sub.3-δ./sub. films

0547877 - FZÚ 2022 RIV US eng J - Journal Article
Tyunina, Marina - Savinov, Maxim - Dejneka, Alexandr
Electrical conductivity in oxygen-substituted SrTiO_3-δ films.
Applied Physics Letters. Roč. 119, Nov. (2021), č. článku 192901. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA19-09671S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : electrical conductivity * oxygen-substituted * SrTiO_3-δ films
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.971, year: 2021
Method of publishing: Limited access
https://doi.org/10.1063/5.0072225

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 filmgrowth. Hoppingmechanismof 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.
Permanent Link: http://hdl.handle.net/11104/0324046