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Energy level alignment and electrical properties of (Ba,Sr)TiO₃/Al₂O₃ interfaces for tunable capacitors

Li, Shunyi ; Wachau, André ; Schafranek, Robert ; Klein, Andreas ; Zheng, Yuliang ; Jakoby, Rolf (2021)
Energy level alignment and electrical properties of (Ba,Sr)TiO₃/Al₂O₃ interfaces for tunable capacitors.
In: Journal of Applied Physics, 2010, 108 (1)
doi: 10.26083/tuprints-00019919
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Energy level alignment and electrical properties of (Ba,Sr)TiO₃/Al₂O₃ interfaces for tunable capacitors
Language: English
Date: 2021
Place of Publication: Darmstadt
Year of primary publication: 2010
Publisher: AIP Publishing
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 108
Issue Number: 1
Collation: 5 Seiten
DOI: 10.26083/tuprints-00019919
Corresponding Links:
Origin: Secondary publication service

The interface formation between Ba₀.₆Sr₀.₄TiO₃ and Al₂O₃ has been studied using photoelectron spectroscopy with in situ sample preparation. A negligible valence band discontinuity, corresponding to a ∼5.6 eV barrier for electron transport at the BST/Al₂O₃ interface is determined. Current-voltage measurements show that the leakage current can be significantly reduced by inserting the Al₂O₃ barrier layer between barium strontium titanate (BST) and Pt electrode. Different charge injection behavior depending on Al₂O₃ thickness is observed, which correspond well with the experimentally determined energy band diagrams. Direct tunneling from the metal electrode into the BST conduction band through the Al₂O₃ barrier layer is observed.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-199191
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP) > Microwave Engineering
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D3: Function and fatigue of oxide electrodes in organic light emitting diodes
Date Deposited: 16 Nov 2021 12:37
Last Modified: 26 Jan 2023 08:29
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19919
PPN: 504066455
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