Journal
NANO LETTERS
Volume 13, Issue 4, Pages 1681-1686Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4001635
Keywords
Atomically thin materials; flexoelectricity; piezoelectricity; piezotronics; nanoelectromechanical systems (NEMS); two-dimensional materials
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Funding
- U.S. Army Research Laboratory, through the Army High Performance Computing Research Center [W911NF-07-0027]
- DARPA YFA Grant [N66001-12-1-4236]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation (NSF)
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The symmetry properties of atomically thin boron nitride (BN) monolayers endow them with piezoelectric properties, whereas the bulk parent crystal of stacked BN layers is not piezoelectric. This suggests potential for unusual electromechanical properties in the few layer regime. In this work, we explore this regime and discover that a bilayer consisting of two BN monolayers exhibits a strong mechanical coupling between curvature and electric fields. Using a mechanical model with parameters obtained from density functional theory, we find that these bilayers amplify in-plane piezoelectric displacements by exceedingly large factors on the order of 10(3)-10(4). We find that this type of electromechanical coupling is an emergent nanoscale property that occurs only for the case of two stacked BN monolayers.
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