Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 50, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201803738
Keywords
hexagonal alpha-In2Se3; layered 2D materials; monolayer; room-temperature ferroelectricity
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Funding
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [CRF-2015-2634-CRG4, CRF-2016-2996-CRG5]
- Hundred Talents Program of the Chinese Academy of Sciences
- Ministry of Science and Technology (MOST) of Taiwan [105-2119-M-009-014-MY3, 107-2112-M-009-024-MY3]
- Center for Emergent Functional Matter Science (CEFMS) of NCTU
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2D ferroelectric material has emerged as an attractive building block for high density data storage nanodevices. Although monolayer van der Waals ferroelectrics have been theoretically predicted, a key experimental breakthrough for such calculations is still not realized. Here, hexagonally stacking alpha-In2Se3 nanoflake, a rarely studied van der Waals polymorph, is reported to exhibit out-of-plane (OOP) and in-plane (IP) ferroelectricity at room temperature. Ferroelectric multidomain states in a hexagonal alpha-In2Se3 nanoflake with uniform thickness can survive to 6 nm. Most strikingly, the electric-field-induced polarization switching and hysteresis loop are, respectively, observed down to the bilayer and monolayer (approximate to 1.2 nm) thicknesses, which designates it as the thinnest layered ferroelectric and verifies the corresponding theoretical calculation. In addition, two types of ferroelectric nanodevices employing the OOP and IP polarizations in 2H alpha-In2Se3 are developed, which are applicable for nonvolatile memories and heterostructure-based nanoelectronics/optoelectronics.
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