Ferroelectricity in hafnia controlled via surface electrochemical state.
Journal
Nature materials
ISSN: 1476-4660
Titre abrégé: Nat Mater
Pays: England
ID NLM: 101155473
Informations de publication
Date de publication:
Sep 2023
Sep 2023
Historique:
received:
21
07
2022
accepted:
26
06
2023
medline:
15
8
2023
pubmed:
15
8
2023
entrez:
14
8
2023
Statut:
ppublish
Résumé
Ferroelectricity in binary oxides including hafnia and zirconia has riveted the attention of the scientific community due to the highly unconventional physical mechanisms and the potential for the integration of these materials into semiconductor workflows. Over the last decade, it has been argued that behaviours such as wake-up phenomena and an extreme sensitivity to electrode and processing conditions suggest that ferroelectricity in these materials is strongly influenced by other factors, including electrochemical boundary conditions and strain. Here we argue that the properties of these materials emerge due to the interplay between the bulk competition between ferroelectric and structural instabilities, similar to that in classical antiferroelectrics, coupled with non-local screening mediated by the finite density of states at surfaces and internal interfaces. Via the decoupling of electrochemical and electrostatic controls, realized via environmental and ultra-high vacuum piezoresponse force microscopy, we show that these materials demonstrate a rich spectrum of ferroic behaviours including partial-pressure-induced and temperature-induced transitions between ferroelectric and antiferroelectric behaviours. These behaviours are consistent with an antiferroionic model and suggest strategies for hafnia-based device optimization.
Identifiants
pubmed: 37580369
doi: 10.1038/s41563-023-01619-9
pii: 10.1038/s41563-023-01619-9
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1144-1151Subventions
Organisme : U.S. Department of Energy (DOE)
ID : DE-SC0021118
Organisme : National Academy of Sciences of Ukraine (NASU)
ID : 1/20-Н (0120U102306)
Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer Nature Limited.
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