Dual-role ion dynamics in ferroionic CuInP2S6: revealing the transition from ferroelectric to ionic switching mechanisms

Xingan Jiang, Xiangping Zhang, Zunyi Deng, Jianming Deng, Xiaolei Wang (), Xueyun Wang () and Weiyou Yang ()
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Xingan Jiang: Ningbo University of Technology
Xiangping Zhang: Southern University of Science and Technology
Zunyi Deng: Beijing Institute of Technology
Jianming Deng: Huizhou University
Xiaolei Wang: Beijing University of Technology
Xueyun Wang: Beijing Institute of Technology
Weiyou Yang: Ningbo University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Due to its “ferroionic” nature, CuInP2S6 combines switchable ferroelectric polarization with highly mobile Cu ions, allowing for multiple resistance states. Its conductive mechanism involves ferroelectric switching, ion migration, and corresponding intercoupling, which are highly sensitive to external electric field. Distinguishing the dominant contribution of either ferroelectric switching or ion migration to dynamic conductivity remains a challenge and the conductive mechanism is not clear yet. Here, based on polarization switching analyses and first-principles calculations, this work demonstrates that the Cu ion migration pathways enable the formation of a quadruple-well state, determining the conductive mechanism. Accordingly, it favors the manipulation of Cu ion transport in the intralayer and interlayer in a controlled manner, and makes a transition from ferroelectric-dominated to ion-migration-dominated conductivity, by tailoring the electric fields. This work deepens the understanding of ion migration dynamics and conductive switching in ferroionic systems, which is critical for the advancement of memristor-based neuromorphic computing.

Date: 2024
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DOI: 10.1038/s41467-024-55160-7

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