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Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum

Single-phase epitaxial Hf(0.5)Zr(0.5)O(2) films with non-centrosymmetric orthorhombic structure have been grown directly on electrode-free corundum (α-Al(2)O(3)) substrates by pulsed laser deposition. A combination of high-resolution X-ray diffraction and X-ray absorption spectroscopy confirms the e...

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Autores principales: Barriuso, Eduardo, Koutsogiannis, Panagiotis, Serrate, David, Herrero-Martín, Javier, Jiménez, Ricardo, Magén, César, Algueró, Miguel, Algarabel, Pedro A., Pardo, José A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003548/
https://www.ncbi.nlm.nih.gov/pubmed/35407350
http://dx.doi.org/10.3390/nano12071232
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author Barriuso, Eduardo
Koutsogiannis, Panagiotis
Serrate, David
Herrero-Martín, Javier
Jiménez, Ricardo
Magén, César
Algueró, Miguel
Algarabel, Pedro A.
Pardo, José A.
author_facet Barriuso, Eduardo
Koutsogiannis, Panagiotis
Serrate, David
Herrero-Martín, Javier
Jiménez, Ricardo
Magén, César
Algueró, Miguel
Algarabel, Pedro A.
Pardo, José A.
author_sort Barriuso, Eduardo
collection PubMed
description Single-phase epitaxial Hf(0.5)Zr(0.5)O(2) films with non-centrosymmetric orthorhombic structure have been grown directly on electrode-free corundum (α-Al(2)O(3)) substrates by pulsed laser deposition. A combination of high-resolution X-ray diffraction and X-ray absorption spectroscopy confirms the epitaxial growth of high-quality films belonging to the Pca2(1) space group, with [111] out-of-plane orientation. The surface of a 7-nm-thick sample exhibits an atomic step-terrace structure with a corrugation of the order of one atomic layer, as proved by atomic force microscopy. Scanning transmission electron microscopy reveals that it consists of grains with around 10 nm lateral size. The polar nature of this film has been corroborated by pyroelectric measurements. These results shed light on the mechanisms of the epitaxial stabilization of the ferroelectric phase of hafnia.
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spelling pubmed-90035482022-04-13 Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum Barriuso, Eduardo Koutsogiannis, Panagiotis Serrate, David Herrero-Martín, Javier Jiménez, Ricardo Magén, César Algueró, Miguel Algarabel, Pedro A. Pardo, José A. Nanomaterials (Basel) Article Single-phase epitaxial Hf(0.5)Zr(0.5)O(2) films with non-centrosymmetric orthorhombic structure have been grown directly on electrode-free corundum (α-Al(2)O(3)) substrates by pulsed laser deposition. A combination of high-resolution X-ray diffraction and X-ray absorption spectroscopy confirms the epitaxial growth of high-quality films belonging to the Pca2(1) space group, with [111] out-of-plane orientation. The surface of a 7-nm-thick sample exhibits an atomic step-terrace structure with a corrugation of the order of one atomic layer, as proved by atomic force microscopy. Scanning transmission electron microscopy reveals that it consists of grains with around 10 nm lateral size. The polar nature of this film has been corroborated by pyroelectric measurements. These results shed light on the mechanisms of the epitaxial stabilization of the ferroelectric phase of hafnia. MDPI 2022-04-06 /pmc/articles/PMC9003548/ /pubmed/35407350 http://dx.doi.org/10.3390/nano12071232 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Barriuso, Eduardo
Koutsogiannis, Panagiotis
Serrate, David
Herrero-Martín, Javier
Jiménez, Ricardo
Magén, César
Algueró, Miguel
Algarabel, Pedro A.
Pardo, José A.
Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title_full Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title_fullStr Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title_full_unstemmed Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title_short Direct Epitaxial Growth of Polar Hf(0.5)Zr(0.5)O(2) Films on Corundum
title_sort direct epitaxial growth of polar hf(0.5)zr(0.5)o(2) films on corundum
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003548/
https://www.ncbi.nlm.nih.gov/pubmed/35407350
http://dx.doi.org/10.3390/nano12071232
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