Ion adsorption-induced reversible polarization switching of a van der Waals layered ferroelectric

Dong-Dong Xu, Ru-Ru Ma, Ai-Ping Fu, Zhao Guan, Ni Zhong (), Hui Peng, Ping-Hua Xiang () and Chun-Gang Duan
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Dong-Dong Xu: East China Normal University
Ru-Ru Ma: East China Normal University
Ai-Ping Fu: Qingdao University
Zhao Guan: East China Normal University
Ni Zhong: East China Normal University
Hui Peng: East China Normal University
Ping-Hua Xiang: East China Normal University
Chun-Gang Duan: East China Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Solid-liquid interface is a key concept of many research fields, enabling numerous physical phenomena and practical applications. For example, electrode-electrolyte interfaces with electric double layers have been widely used in energy storage and regulating physical properties of functional materials. Creating a specific interface allows emergent functionalities and effects. Here, we show the artificial control of ferroelectric-liquid interfacial structures to switch polarization states reversibly in a van der Waals layered ferroelectric CuInP2S6 (CIPS). We discover that upward and downward polarization states can be induced by spontaneous physical adsorption of dodecylbenzenesulphonate anions and N,N-diethyl-N-methyl-N-(2-methoxyethyl)-ammonium cations, respectively, at the ferroelectric-liquid interface. This distinctive approach circumvents the structural damage of CIPS caused by Cu-ion conductivity during electrical switching process. Moreover, the polarized state features super-long retention time (>1 year). The interplay between ferroelectric dipoles and adsorbed organic ions has been studied systematically by comparative experiments and first-principles calculations. Such ion adsorption-induced reversible polarization switching in a van der Waals ferroelectric enriches the functionalities of solid-liquid interfaces, offering opportunities for liquid-controlled two-dimensional ferroelectric-based devices.

Date: 2021
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DOI: 10.1038/s41467-021-20945-7

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