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Influence of Defects on the Schottky Barrier Height at BaTiO₃/RuO₂ Interfaces

Schuldt, Katharina N. S. ; Ding, Hui ; Jaud, Jean-Christophe ; Koruza, Jurij ; Klein, Andreas (2022)
Influence of Defects on the Schottky Barrier Height at BaTiO₃/RuO₂ Interfaces.
In: Physica status solidi (a), 2021, 218 (14)
doi: 10.26083/tuprints-00020139
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Influence of Defects on the Schottky Barrier Height at BaTiO₃/RuO₂ Interfaces
Language: English
Date: 7 April 2022
Place of Publication: Darmstadt
Year of primary publication: 2021
Publisher: Wiley-VCH GmbH
Journal or Publication Title: Physica status solidi (a)
Volume of the journal: 218
Issue Number: 14
Collation: 9 Seiten
DOI: 10.26083/tuprints-00020139
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

The Schottky barrier formation between polycrystalline acceptor‐doped BaTiO₃ and high work function RuO₂ is studied using photoelectron spectroscopy. Schottky barrier heights for electrons of ≈1.4 eV are determined, independent of doping level and oxygen vacancy concentration of the substrates. The insensitivity of the barrier height is related to the high permittivity of BaTiO₃, which results in space‐charge regions (SCRs) being considerably wider than the inelastic mean free path of the photoelectrons. SCRs at any kind of interface should, therefore, be more important for the electronic and ionic conductivities in BaTiO₃ than in materials with lower permittivity. A Ba‐rich phase at the surface of reduced acceptor‐doped BaTiO₃ is also identified, which is explained by the formation of Ti vacancies in the 2D electron gas region at the surface.

Uncontrolled Keywords: BaTiO3 , defects, Schottky barriers
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-201392
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 > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Electronic Structure of Materials (ESM)
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
LOEWE > LOEWE-Schwerpunkte > FLAME - Fermi Level Engineering Antiferroelektrischer Materialien für Energiespeicher und Isolatoren
Date Deposited: 07 Apr 2022 12:11
Last Modified: 06 Dec 2023 09:28
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20139
PPN: 504268848
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