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Issue 21, 2020
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Unconventional out-of-plane domain inversion via in-plane ionic migration in a van der Waals ferroelectric

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Abstract

Two-dimensional ferroelectrics have gained attention because of their unique ferroelectric properties, e.g., giant negative electrostriction, odd/even layer effect, intercorrelation of in-plane and out-of-plane ferroelectricity, ferroelectric metal nature or tunable quadruple-well ferroelectric property. Here, the interplay between ionic kinetics and ferroelectric switching properties is reported in a model system, CuInP2S6, one of the few van der Waals room-temperature ferroelectric crystals. An unconventional out-of-plane domain inversion phenomenon induced by an in-plane electric field has been observed and clarified experimentally. The intralayer hopping motions of Cu-ions can play a role as media of ferroelectric domain inversion. These findings not only provide direct evidence for the microscopic origin of ferroelectric polarization in CuInP2S6, but also establish a new mechanism to reverse ferroelectric dipoles simply and effectively, offering opportunities for both fundamental studies and new device applications in information and energy storage.

Graphical abstract: Unconventional out-of-plane domain inversion via in-plane ionic migration in a van der Waals ferroelectric

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Supplementary files

Article information


Submitted
31 Mar 2020
Accepted
29 Apr 2020
First published
29 Apr 2020

J. Mater. Chem. C, 2020,8, 6966-6971
Article type
Communication

Unconventional out-of-plane domain inversion via in-plane ionic migration in a van der Waals ferroelectric

D. Xu, R. Ma, Y. Zhao, Z. Guan, Q. Zhong, R. Huang, P. Xiang, N. Zhong and C. Duan, J. Mater. Chem. C, 2020, 8, 6966
DOI: 10.1039/D0TC01620A

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