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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. (Publisher's Version)
In: Journal of Applied Physics, 115 (24), AIP Publishing, ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00019928,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
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
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.

Journal or Publication Title: Journal of Applied Physics
Journal volume: 115
Number: 24
Publisher: AIP Publishing
Collation: 5 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 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: 17 Nov 2021 13:18
DOI: 10.26083/tuprints-00019928
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199287
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19928
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