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journal article·2024-01Open access

Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe‐Rich (GeTe)m(Sb2Te3)n Lamellae

Stefano Cecchi, Jamo Momand, Daniele Dragoni, Omar Abou El Kheir, Federico Fagiani, Dominik Kriegner, Christian Rinaldi, Fabrizio Arciprete, Vaclav Holý, Bart J. Kooi, Marco Bernasconi, Raffaella Calarco

Advanced Science· Volume 11· Issue 1
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Source abstract

Abstract

Abstract The possibility to engineer (GeTe)m(Sb2Te3)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(Sb2Te3)n with GeTe‐rich composition is presented. These layered films feature a tunable distribution of (GeTe)m(Sb2Te3)1 blocks of different sizes. Breakthrough evidence of ferroelectric displacement in thick (GeTe)m(Sb2Te3)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.
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Research context

Electronic materials

OpenAlex topics: Phase-change materials and chalcogenides · 2D Materials and Applications · Advanced Thermoelectric Materials and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

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

Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands

Dipartimento di Fisica Politecnico di Milano P.zza Leonardo da Vinci 32 20133 Milano Italy

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

Dipartimento di Fisica Università di Roma “Tor Vergata” Via della Ricerca Scientifica 1 00133 Rome Italy

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

CNR Institute for Microelectronics and Microsystems–IMM Consiglio Nazionale delle Ricerche Via del Fosso del Cavaliere 100 00133 Roma Italy

Funding

Horizon 2020 Framework Programme · Leibniz-Gemeinschaft · Akademie Věd České Republiky · Grantová Agentura České Republiky · Ministero dell'Università e della Ricerca

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