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Title: Origin of giant negative piezoelectricity in a layered van der Waals ferroelectric
Authors: You, Lu
Zhang, Yang
Zhou, Shuang
Chaturvedi, Apoorva
Morris, Samuel A.
Liu, Fucai
Chang, Lei
Ichinose, Daichi
Funakubo, Hiroshi
Hu, Weijin
Wu, Tom
Liu, Zheng
Dong, Shuai
Wang, Junling
Keywords: DRNTU::Engineering::Materials
Van der Waals Forces
Issue Date: 2019
Source: You, L., Zhang, Y., Zhou, S., Chaturvedi, A., Morris, S. A., Liu, F., . . . Wang, J. (2019). Origin of giant negative piezoelectricity in a layered van der Waals ferroelectric. Science Advances, 5(4), eaav3780-. doi:10.1126/sciadv.aav3780
Series/Report no.: Science Advances
Abstract: Recent research on piezoelectric materials is predominantly devoted to enhancing the piezoelectric coefficient, but overlooks its sign, largely because almost all of them exhibit positive longitudinal piezoelectricity. The only experimentally known exception is ferroelectric polymer poly(vinylidene fluoride) and its copolymers, which condense via weak van der Waals (vdW) interaction and show negative piezoelectricity. Here we report quantitative determination of giant intrinsic negative longitudinal piezoelectricity and electrostriction in another class of vdW solids—two-dimensional (2D) layered ferroelectric CuInP2S6. With the help of single crystal x-ray crystallography and density-functional theory calculations, we unravel the atomistic origin of negative piezoelectricity in this system, which arises from the large displacive instability of Cu ions coupled with its reduced lattice dimensionality. Furthermore, the sizable piezoelectric response and negligible substrate clamping effect of the 2D vdW piezoelectric materials warrant their great potential in nanoscale, flexible electromechanical devices.
DOI: 10.1126/sciadv.aav3780
Rights: © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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