Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe) m (Sb 2 Te 3 ) n Lamellae.

Autor: Cecchi S; Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy.; Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany., Momand J; Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands., Dragoni D; Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy., Abou El Kheir O; Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy., Fagiani F; Dipartimento di Fisica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133, Milano, Italy., Kriegner D; Institute of Solid State and Materials Physics, Technische Universität Dresden, Helmholtzstr. 10, 01069, Dresden, Germany.; Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10/112, 16200, Praha 6, Czech Republic., Rinaldi C; Dipartimento di Fisica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133, Milano, Italy., Arciprete F; Dipartimento di Fisica, Università di Roma 'Tor Vergata', Via della Ricerca Scientifica 1, 00133, Rome, Italy., Holý V; Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116, Praha, Czech Republic.; Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic., Kooi BJ; Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands., Bernasconi M; Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy., Calarco R; Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany.; CNR Institute for Microelectronics and Microsystems-IMM, Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Jan; Vol. 11 (1), pp. e2304785. Date of Electronic Publication: 2023 Nov 21.
DOI: 10.1002/advs.202304785
Abstrakt: The possibility to engineer (GeTe) m (Sb 2 Te 3 ) n phase-change materials to co-host ferroelectricity is extremely attractive. The combination of these functionalities holds great technological impact, potentially enabling the design of novel multifunctional devices. Here an experimental and theoretical study of epitaxial (GeTe) m (Sb 2 Te 3 ) n with GeTe-rich composition is presented. These layered films feature a tunable distribution of (GeTe) m (Sb 2 Te 3 ) 1 blocks of different sizes. Breakthrough evidence of ferroelectric displacement in thick (GeTe) m (Sb 2 Te 3 ) 1 lamellae is provided. The density functional theory calculations suggest the formation of a tilted (GeTe) m slab sandwiched in GeTe-rich blocks. That is, the net ferroelectric polarization is confined almost in-plane, representing an unprecedented case between 2D and bulk ferroelectric materials. The ferroelectric behavior is confirmed by piezoresponse force microscopy and electroresistive measurements. The resilience of the quasi van der Waals character of the films, regardless of their composition, is also demonstrated. Hence, the material developed hereby gathers in a unique 2D platform the phase-change and ferroelectric switching properties, paving the way for the conception of innovative device architectures.
(© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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