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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. (Publisher's Version)
In: Journal of Applied Physics, 108 (1), AIP Publishing, ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00019919,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Energy level alignment and electrical properties of (Ba,Sr)TiO₃/Al₂O₃ interfaces for tunable capacitors
Language: English
Abstract:

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.

Journal or Publication Title: Journal of Applied Physics
Journal volume: 108
Number: 1
Publisher: AIP Publishing
Collation: 5 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
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: 16 Nov 2021 12:37
DOI: 10.26083/tuprints-00019919
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199191
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19919
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