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

J 2024

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

CECCHI, Stefano, Jamo MOMAND, Daniele DRAGONI, Abou El Kheir OMAR, Federico FAGIANI et. al.

Basic information

Original name

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

Authors

CECCHI, Stefano, Jamo MOMAND, Daniele DRAGONI, Abou El Kheir OMAR, Federico FAGIANI, Dominik KRIEGNER, Christian RINALDI, Fabrizio ARCIPRETE, Václav HOLÝ (203 Czech Republic, belonging to the institution), Bart J. KOOI, Marco BERNASCONI and Raffaella CALARCO

Edition

Advanced Science, Wiley, 2024, 2198-3844

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 15.100 in 2022

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1002/advs.202304785

UT WoS

001108011600001

Keywords in English

2D ferroelectrics; van der Waals; molecular beam epitaxy; phase-change materials; density functional theory calculations

Abstract

V originále

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.

Citovat

CECCHI, Stefano, Jamo MOMAND, Daniele DRAGONI, Abou El Kheir OMAR, Federico FAGIANI, Dominik KRIEGNER, Christian RINALDI, Fabrizio ARCIPRETE, Václav HOLÝ, Bart J. KOOI, Marco BERNASCONI and Raffaella CALARCO. Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe)m(Sb2Te3)n Lamellae. Advanced Science. Wiley, 2024, vol. 11, No 1, p. 1-11. ISSN 2198-3844. Available from: https://dx.doi.org/10.1002/advs.202304785.

@article{2362839,
   author = {Cecchi, Stefano and Momand, Jamo and Dragoni, Daniele and Omar, Abou El Kheir and Fagiani, Federico and Kriegner, Dominik and Rinaldi, Christian and Arciprete, Fabrizio and Holý, Václav and Kooi, Bart J. and Bernasconi, Marco and Calarco, Raffaella},
   article_number = {1},
   doi = {http://dx.doi.org/10.1002/advs.202304785},
   keywords = {2D ferroelectrics; van der Waals; molecular beam epitaxy; phase-change materials; density functional theory calculations},
   language = {eng},
   issn = {2198-3844},
   journal = {Advanced Science},
   title = {Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe)m(Sb2Te3)n Lamellae},
   url = {https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202304785},
   volume = {11},
   year = {2024}
}

TY  - JOUR
ID  - 2362839
AU  - Cecchi, Stefano - Momand, Jamo - Dragoni, Daniele - Omar, Abou El Kheir - Fagiani, Federico - Kriegner, Dominik - Rinaldi, Christian - Arciprete, Fabrizio - Holý, Václav - Kooi, Bart J. - Bernasconi, Marco - Calarco, Raffaella
PY  - 2024
TI  - Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe)m(Sb2Te3)n Lamellae
JF  - Advanced Science
VL  - 11
IS  - 1
SP  - 1-11
EP  - 1-11
PB  - Wiley
SN  - 21983844
KW  - 2D ferroelectrics
KW  - van der Waals
KW  - molecular beam epitaxy
KW  - phase-change materials
KW  - density functional theory calculations
UR  - https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202304785
N2  - 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.
ER  -

CECCHI, Stefano, Jamo MOMAND, Daniele DRAGONI, Abou El Kheir OMAR, Federico FAGIANI, Dominik KRIEGNER, Christian RINALDI, Fabrizio ARCIPRETE, Václav HOLÝ, Bart J. KOOI, Marco BERNASCONI and Raffaella CALARCO. Thick Does the Trick: Genesis of Ferroelectricity in 2D GeTe-Rich (GeTe)m(Sb2Te3)n Lamellae. \textit{Advanced Science}. Wiley, 2024, vol.~11, No~1, p.~1-11. ISSN~2198-3844. Available from: https://dx.doi.org/10.1002/advs.202304785.

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