Atomic-scale symmetry breaking for out-of-plane piezoelectricity in two-dimensional transition metal dichalcogenides

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Title
Atomic-scale symmetry breaking for out-of-plane piezoelectricity in two-dimensional transition metal dichalcogenides
Author(s)
Seunghun Kang; Sera Kim; Sera Jeon; Woo-Sung Jang; Daehee Seol; Young-Min Kim; Jaekwang Lee; Heejun Yang; Yunseok Kim
Publication Date
2019-04
Journal
NANO ENERGY, v.58, no., pp.57 - 62
Publisher
Elsevier BV
Abstract
It is known that only in-plane piezoelectricity exists in pristine two dimensional (2D) transition metal dichalcogenides (TMDs). In this study, we demonstrate the creation of strong out-of-plane piezoelectricity in semiconducting 2H-MoTe2 flakes by an artificial atomic-scale symmetry breaking. The atomic-scale symmetry breaking associated with flexoelectricity was realized through Te vacancy formation by a simple thermal annealing of the 2D TMDs. The strong out-of-plane piezoelectricity was experimentally measured and confirmed by theoretical calculations. This strategy of atomic-scale symmetry modulation for out-of-plane piezoelectricity can be easily applied to a broader class of 2D TMD materials that have not been used for applications with out-of-plane piezoelectricity. Accordingly, it can stimulate the expansion of practical energy device applications with 2D TMD materials. © 2019 Elsevier Ltd.
URI
https://pr.ibs.re.kr/handle/8788114/5642
ISSN
2211-2855
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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