| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schroeder, Uwe
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (27/27 displayed)
- 2024Electrically induced cancellation and inversion of piezoelectricity in ferroelectric Hf0.5Zr0.5O2
- 2024Strain as a Global Factor in Stabilizing the Ferroelectric Properties of ZrO<sub>2</sub>citations
- 2023Strain as a global factor in stabilizing the ferroelectric properties of ZrO 2citations
- 2023Influence of the Ozone Dose Time during Atomic Layer Deposition on the Ferroelectric and Pyroelectric Properties of 45 nm-Thick ZrO2 Filmscitations
- 2023Influence of the ozone dose time during atomic layer deposition on the ferroelectric and pyroelectric properties of 45 nm-thick ZrO 2 filmscitations
- 2022Role of Oxygen Source on Buried Interfaces in Atomic-Layer-Deposited Ferroelectric Hafnia-Zirconia Thin Filmscitations
- 2022MOx in ferroelectric memories
- 2022Influence of Si-Doping on 45 nm Thick Ferroelectric ZrO2 Filmscitations
- 2022Oxygen vacancy concentration as a function of cycling and polarization state in TiN/Hf 0.5 Zr 0.5 O 2 /TiN ferroelectric capacitors studied by x-ray photoemission electron microscopycitations
- 2022Raman Spectroscopy as a Key Method to Distinguish the Ferroelectric Orthorhombic Phase in Thin ZrO2-Based Filmscitations
- 2021Reliability aspects of ferroelectric hafnium oxide for application in non-volatile memoriescitations
- 2021Chemical Stability of IrO$_{2}$ Top Electrodes in Ferroelectric Hf$_{0.5}$Zr$_{0.5}$O$_{2}$ ‐Based Metal–Insulator–Metal Structures: The Impact of Annealing Gascitations
- 2021Impact of vacancies and impurities on ferroelectricity in PVD- and ALD-grown HfO$_2$ filmscitations
- 2020Enhanced ferroelectric polarization in TiN/HfO2/TiN capacitors by interface designcitations
- 2020Influence of oxygen content on the structure and reliability of ferroelectric HfxZr1−xO2 layerscitations
- 2020Enhanced Ferroelectric Polarization in TiN/HfO$_{2}$/TiN Capacitors by Interface Designcitations
- 2019Local structural investigation of hafnia-zirconia polymorphs in powders and thin films by X-ray absorption spectroscopycitations
- 2019Recent progress for obtaining the ferroelectric phase in hafnium oxide based films: impact of oxygen and zirconiumcitations
- 2019Recent progress for obtaining the ferroelectric phase in hafnium oxide based filmscitations
- 2018Review and perspective on ferroelectric HfO₂-based thin films for memory applicationscitations
- 2018Effect of Annealing Ferroelectric HfO₂ Thin Films: In Situ, High Temperature X-Ray Diffractioncitations
- 2018Origin of Temperature-Dependent Ferroelectricity in SiDoped HfO₂citations
- 2018Hafnium oxide based ferroelectric devices for memories and beyondcitations
- 2018Atomic Structure of Domain and Interphase Boundaries in Ferroelectric HfO₂citations
- 2015Ultra-thin ZrO2/SrO/ZrO2 insulating stacks for future dynamic random access memory capacitor applicationscitations
- 2014Conduction mechanisms and breakdown characteristics of Al2O 3-doped ZrO2 high-k dielectrics for three-dimensional stacked metal-insulator-metal capacitorscitations
- 2012Incipient ferroelectricity in Al-doped HfO2 thin filmscitations
Places of action
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article
Local structural investigation of hafnia-zirconia polymorphs in powders and thin films by X-ray absorption spectroscopy
Abstract
Despite increasing attention for the recently found ferro- and antiferroelectric properties, the polymorphism in hafnia- and zirconia-based thin films is still not sufficiently understood. In the present work, we show that it is important to have a good quality X-ray absorption spectrum to go beyond an analysis of the only the first coordination shell. Equally important is to analyze both EXAFS and XANES spectra in combination with theoretical modelling to distinguish the relevant phases even in bulk materials and to separate structural from chemical effects. As a first step toward the analysis of thin films, we start with the analysis of bulk references. After that, we successfully demonstrate an approach that allows us to extract high-quality spectra also for 20 nm thin films. Our analysis extends to the second coordination shell and includes effects created by chemical substitution of Hf with Zr to unambiguously discriminate the different polymorphs. The trends derived from X-ray absorption spectroscopy agree well with X-ray diffraction measurements. In this work we clearly identify a gradual transformation from monoclinic to tetragonal phase as the Zr content of the films increases. We separated structural effects from effects created by chemical disorder when ration of Hf:Zr is varied and found differences for the incorporation of the substitute atoms between powders and thin films, which we attribute to the different fabrication routes. This work opens the door for further in-depth structural studies to shine light into the chemistry and physics of these novel ferroelectric thin films that show high application relevance.