Journal
ACS NANO
Volume 16, Issue 1, Pages 1308-1317Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c09183
Keywords
antiferroelectric; two-dimensional ferroelectrics; GeSe; antiferroelectric-ferroelectric phase transition; electric field
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Funding
- National Key Research and Development Program of China [2017YFA0303403]
- National Natural Science Foundation of China [12074119, 11874149, 12134003, 62125404, 61974042]
- Shanghai Science and Technology Innovation Action Plan [19JC1416700]
- Natural Science Foundation of Shanghai [20ZR1418300]
- ECNU (East China Normal University) Multifunctional Platform for Innovation [006]
- Fundamental Research Funds for the Central Universities
- Key Research Project of Zhejiang Lab [2021MD0AC01]
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The experimental discovery of the reversible antiferroelectric to ferroelectric transition in van der Waals layered alpha-GeSe at room temperature is reported. This material exhibits high resistance temperature and has potential as a stable building block for creating artificial 2D multiferroics at room temperature.
Searching van der Waals ferroic materials that can work under ambient conditions is of critical importance for developing ferroic devices at the two-dimensional limit. Here we report the experimental discovery of electric-field-induced reversible antiferroelectric (AFE) to ferroelectric (FE) transition at room temperature in van der Waals layered alpha-GeSe, employing Raman spectroscopy, transmission electron microscopy, second-harmonic generation, and piezoelectric force microscopy consolidated by first-principles calculations. An orientationdependent AFE-FE transition provides strong evidence that the in-plane (IP) polarization vector aligns along the armchair rather than zigzag direction in alpha-GeSe. In addition, temperature-dependent Raman spectra showed that the IP polarization could sustain up to higher than 700 K. Our findings suggest that alpha-GeSe, which is also a potential ferrovalley material, could be a robust building block for creating artificial 2D multiferroics at room temperature.
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