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Barrier height at (Ba,Sr)TiO₃/Pt interfaces studied by photoemission

Schafranek, R. ; Payan, S. ; Maglione, M. ; Klein, Andreas (2022)
Barrier height at (Ba,Sr)TiO₃/Pt interfaces studied by photoemission.
In: Physical Review B, 77 (19)
doi: 10.26083/tuprints-00021101
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Barrier height at (Ba,Sr)TiO₃/Pt interfaces studied by photoemission
Language: English
Date: 2022
Place of Publication: Darmstadt
Publisher: American Physical Society
Journal or Publication Title: Physical Review B
Volume of the journal: 77
Issue Number: 19
Collation: 13 Seiten
DOI: 10.26083/tuprints-00021101
Corresponding Links:
Origin: Secondary publication service

The interface formation of Nb-doped SrTiO₃ single crystals and (Ba,Sr)TiO₃ thin films with Pt has been studied by using photoelectron spectroscopy with in situ sample preparation. For the single crystal sample, a Schottky barrier height for electrons of 0.5–0.6 eV is determined after deposition of Pt in vacuum environment. After annealing in 0.05 Pa oxygen pressure, a strong increase in the barrier height to ≥1.2 eV is observed. X-ray induced photovoltages of up to 0.7 eV are observed in this case and have to be taken into account for a proper determination of the barrier height. A subsequent annealing in vacuum reduces the barrier again. Hence, the barrier height can be reversibly switched between an oxidized state with a large barrier height and a reduced state with a low barrier height. Quantitative analysis of the barrier heights indicates that the changes are related to the changes of interfacial defect concentration. Due to the occurrence of a Ti³⁺ related signal, the defects are identified as oxygen vacancies. The same effects are observed at interfaces between Pt and (Ba,Sr)TiO₃ thin films with a smaller absolute value of the barrier height in the oxidized state of ∼1 eV. Deposition of (Ba,Sr)TiO₃ onto a metallic Pt substrate also results in a barrier height of 1.0 eV.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-211018
Classification DDC: 500 Science and mathematics > 530 Physics
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 19 Apr 2022 13:35
Last Modified: 06 Feb 2023 08:41
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21101
PPN: 504324306
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