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Modification of energy band alignment and electric properties of Pt/Ba₀.₆Sr₀.₄TiO₃/Pt thin-film ferroelectric varactors by Ag impurities at interfaces

Hirsch, S. ; Komissinskiy, Philipp ; Flege, Stefan ; Li, S. ; Rachut, Karsten ; Klein, Andreas ; Alff, Lambert (2021)
Modification of energy band alignment and electric properties of Pt/Ba₀.₆Sr₀.₄TiO₃/Pt thin-film ferroelectric varactors by Ag impurities at interfaces.
In: Journal of Applied Physics, 2014, 115 (24)
doi: 10.26083/tuprints-00019928
Article, Secondary publication, Publisher's Version

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Abstract

We report on the effects of Ag impurities at interfaces of parallel-plate Pt/Ba₀.₆Sr₀.₄TiO₃/Pt thin film ferroelectric varactors. Ag impurities occur at the interfaces due to diffusion of Ag from colloidal silver paint used to attach the varactor samples with their back side to the plate heated at 600–750 °C during deposition of Ba₀.₆Sr₀.₄TiO₃. X-ray photoelectron spectroscopy and secondary ion mass spectrometry suggest that amount and distribution of Ag adsorbed at the interfaces depend strongly on the adsorbent surface layer. In particular, Ag preferentially accumulates on top of the Pt bottom electrode. The presence of Ag significantly reduces the barrier height between Pt and Ba₀.₆Sr₀.₄TiO₃ leading to an increased leakage current density and, thus, to a severe degradation of the varactor performance.

Item Type: Article
Erschienen: 2021
Creators: Hirsch, S. ; Komissinskiy, Philipp ; Flege, Stefan ; Li, S. ; Rachut, Karsten ; Klein, Andreas ; Alff, Lambert
Type of entry: Secondary publication
Title: Modification of energy band alignment and electric properties of Pt/Ba₀.₆Sr₀.₄TiO₃/Pt thin-film ferroelectric varactors by Ag impurities at interfaces
Language: English
Date: 2021
Year of primary publication: 2014
Publisher: AIP Publishing
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 115
Issue Number: 24
Collation: 5 Seiten
DOI: 10.26083/tuprints-00019928
URL / URN: https://tuprints.ulb.tu-darmstadt.de/19928
Corresponding Links:
Origin: Secondary publication service
Abstract:

We report on the effects of Ag impurities at interfaces of parallel-plate Pt/Ba₀.₆Sr₀.₄TiO₃/Pt thin film ferroelectric varactors. Ag impurities occur at the interfaces due to diffusion of Ag from colloidal silver paint used to attach the varactor samples with their back side to the plate heated at 600–750 °C during deposition of Ba₀.₆Sr₀.₄TiO₃. X-ray photoelectron spectroscopy and secondary ion mass spectrometry suggest that amount and distribution of Ag adsorbed at the interfaces depend strongly on the adsorbent surface layer. In particular, Ag preferentially accumulates on top of the Pt bottom electrode. The presence of Ag significantly reduces the barrier height between Pt and Ba₀.₆Sr₀.₄TiO₃ leading to an increased leakage current density and, thus, to a severe degradation of the varactor performance.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-199287
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 17 Nov 2021 13:18
Last Modified: 18 Nov 2021 06:05
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