We report on the ferroelectric properties of single-phase wurtzite ScGaN grown on GaN by plasma-assisted molecular beam epitaxy. Distinct ferroelectric switching behavior was confirmed by detailed electrical characterization. Coercive fields in the range of 2.0–3.0 MV/cm and large, retainable remnant polarization in the range of 60–120 μC/cm2 are unambiguously demonstrated for ScGaN epilayers with Sc contents of 0.31–0.41. Taking advantage of the widely tunable energy bandgap of III-nitride semiconductors, the demonstration of ferroelectricity in ScGaN, together with the recently reported ferroelectric ScAlN, will enable a broad range of emerging applications with combined functionality in ferroelectric, electronic, optoelectronic, photovoltaic, and/or photonic devices and systems.
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13 September 2021
Research Article|
September 15 2021
Fully epitaxial ferroelectric ScGaN grown on GaN by molecular beam epitaxy
Ding Wang
;
Ding Wang
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Ping Wang
;
Ping Wang
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Boyu Wang
;
Boyu Wang
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
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Zetian Mi
Zetian Mi
a)
Department of Electrical Engineering and Computer Science, University of Michigan
, Ann Arbor, Michigan 48109, USA
a)Author to whom correspondence should be addressed: ztmi@umich.edu
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a)Author to whom correspondence should be addressed: ztmi@umich.edu
Appl. Phys. Lett. 119, 111902 (2021)
Article history
Received:
June 15 2021
Accepted:
August 25 2021
Citation
Ding Wang, Ping Wang, Boyu Wang, Zetian Mi; Fully epitaxial ferroelectric ScGaN grown on GaN by molecular beam epitaxy. Appl. Phys. Lett. 13 September 2021; 119 (11): 111902. https://doi.org/10.1063/5.0060021
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