Locally controlled Cu-ion transport in layered ferroelectric CuInP2S6

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Title: Locally controlled Cu-ion transport in layered ferroelectric CuInP2S6
Authors: Balke, NinaNeumayer, Sabine M.Brehm, John A.Rodriguez, Brian J.et al.
Permanent link: http://hdl.handle.net/10197/12001
Date: 23-Jul-2018
Online since: 2021-03-02T16:43:22Z
Abstract: Metal thiophosphates are attracting growing attention in the context of quasi-two-dimensional van der Waals functional materials. Alkali thiophosphates are investigated as ion conductors for solid electrolytes, and transition-metal thiophosphates are explored as a new class of ferroelectric materials. For the latter, a representative copper indium thiophosphate is ferrielectric at room temperature and, despite low polarization, exhibits giant negative electrostrictive coefficients. Here, we reveal that ionic conductivity in this material enables localized extraction of Cu ions from the lattice with a biased scanning probe microscopy tip, which is surprisingly reversible. The ionic conduction is tracked through local volume changes with a scanning probe microscopy tip providing a current-free probing technique, which can be explored for other thiophosphates of interest. Nearly 90 nm-tall crystallites can be formed and erased reversibly on the surface of this material as a result of ionic motion, the size of which can be sensitively controlled by both magnitude and frequency of the electric field, as well as the ambient temperature. These experimental results and density functional theory calculations point to a remarkable resilience of CuInP2S6 to large-scale ionic displacement and Cu vacancies, in part enabled by the metastability of Cu-deficient phases. Furthermore, we have found that the piezoelectric response of CuInP2S6 is enhanced by about 45% when a slight ionic modification is carried out with applied field. This new mode of modifying the lattice of CuInP2S6, and more generally ionically conducting thiophosphates, posits new prospects for their applications in van der Waals heterostructures, possibly in the context of catalytic or electronic functionalities.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: American Chemical Society
Journal: ACS Applied Materials and Interfaces
Volume: 10
Issue: 32
Start page: 27188
End page: 27194
Copyright (published version): 2018 American Chemical Society
Keywords: Transition-metal chalcogenophosphateCopper indium thiophosphateLayered ferroelectricIonic transportScanning probe microscopyThin-film cathode
DOI: 10.1021/acsami.8b08079
Language: en
Status of Item: Peer reviewed
ISSN: 1944-8244
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Conway Institute Research Collection
Physics Research Collection

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