Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 32, Pages 27424-27431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06325
Keywords
two-dimensional transition-metal dichalcogenides; corrugation; flexoelectricity; out-of-plane piezoelectricity; piezoresponse force microscopy
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2014R1A4A1008474]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2017R1A2B2003342]
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2015R1C1A1A01053810]
- [IBS-R011-D1]
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Piezoelectricity crystallographically exists only in the in-plane direction in two-dimensional transition metal dichalcogenides. Here, we demonstrated flexoelectricity-tunable out-of-plane piezoelectricity in semiconducting 2H-MoTe2 flakes by creating surface corrugation. In particular, the strong out-of plane piezoelectricity and its spatial variation depending on local flexoelectricity was observed even though crystallographically there exists only in-plane piezoelectricity. Surface corrugation mediated flexoelectricity tuning can be applied to other two-dimensional or thin-layered materials and, furthermore, the results could provide useful information on the interweaving nature between mechanical stimulus and electric dipole in low-dimensional materials.
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