We report on the thickness scaling behavior of ferroelectric Sc0.3Al0.7N (ScAlN) films grown on Mo substrates by molecular beam epitaxy. Switchable ferroelectricity is confirmed in ScAlN films with thicknesses ranging from 100 to 5 nm. An increase in coercive field and a significant diminution of remnant polarization are found when the ferroelectric layer is scaled down to below 20 nm. Notably, a switching voltage of 2–3.8 V and saturated remnant polarization of ∼23 μC/cm2 are measured in 5 nm thick ScAlN. X-ray diffractions and transmission electron microscopy studies indicate that the increase in coercive field and diminishment in switchable polarization can be closely linked to the surface oxidation and strain state in ultrathin ScAlN films. This work sheds light on the fundamental thickness scaling fingerprints of ScAlN thin films and represents an important step for next-generation compact and power-efficient devices and applications based on nitride ferroelectrics.
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30 January 2023
Research Article|
January 31 2023
Thickness scaling down to 5 nm of ferroelectric ScAlN on CMOS compatible molybdenum grown by molecular beam epitaxy
Ding Wang;
Ding Wang
(Conceptualization, Data curation, Formal analysis, Investigation, Validation, Writing – original draft, Writing – review & editing)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Ping Wang
;
Ping Wang
a)
(Conceptualization, Formal analysis, Investigation, Writing – original draft, Writing – review & editing)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Shubham Mondal
;
Shubham Mondal
(Investigation, Methodology)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Mingtao Hu
;
Mingtao Hu
(Formal analysis, Investigation, Methodology)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Danhao Wang
;
Danhao Wang
(Investigation, Methodology)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Yuanpeng Wu
;
Yuanpeng Wu
(Formal analysis, Investigation, Methodology)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Tao Ma
;
Tao Ma
(Formal analysis, Investigation, Methodology)
2
Michigan Center for Materials Characterization, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Zetian Mi
Zetian Mi
a)
(Conceptualization, Data curation, Funding acquisition, Project administration, Supervision, Writing – review & editing)
1
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Appl. Phys. Lett. 122, 052101 (2023)
Article history
Received:
November 24 2022
Accepted:
January 13 2023
Citation
Ding Wang, Ping Wang, Shubham Mondal, Mingtao Hu, Danhao Wang, Yuanpeng Wu, Tao Ma, Zetian Mi; Thickness scaling down to 5 nm of ferroelectric ScAlN on CMOS compatible molybdenum grown by molecular beam epitaxy. Appl. Phys. Lett. 30 January 2023; 122 (5): 052101. https://doi.org/10.1063/5.0136265
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