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Anisotropic ion migration and electronic conduction in van der Waals ferroelectric CuInP2S6

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Zhang, Dawei, Luo, Zheng-Dong, Yao, Yin, Schoenherr, Peggy, Sha, Chuhan, Pan, Ying, Sharma, Pankaj, Alexe, Marin and Seidel, Jan (2021) Anisotropic ion migration and electronic conduction in van der Waals ferroelectric CuInP2S6. Nano Letters . doi:10.1021/acs.nanolett.0c04023 (In Press)

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Official URL: http://dx.doi.org/10.1021/acs.nanolett.0c04023

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Abstract

Van der Waals (vdW) thio- and seleno-phosphates have recently gained considerable attention for the use as “active” dielectrics in two-dimensional/quasi-two-dimensional electronic devices. Bulk ionic conductivity in these materials has been identified as a key factor for the control of their electronic properties. However, direct evidence of specific ion species’ migration at the nanoscale, particularly under electric fields, and its impact on material properties has been elusive. Here, we report on direct evidence of a phase-selective anisotropic Cu-ion-hopping mechanism in copper indium thiophosphate (CuInP2S6) through detailed scanning probe microscopy measurements. A two-step Cu-hopping path including a first intralayer hopping (in-plane) and second interlayer hopping (out-of-plane) crossing the vdW gap is unveiled. Evidence of electrically controlled Cu ion migration is further verified by nanoscale energy-dispersive X-ray spectroscopy (EDS) mapping. These findings offer new insight into anisotropic ionic manipulation in layered vdW ferroelectric/dielectric materials for emergent vdW electronic device design.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Anisotropy, Ferroelectric crystals, Copper ions, Ionic crystals, Van der Waals forces, Dielectrics, Electronic apparatus and appliances
Journal or Publication Title: Nano Letters
Publisher: American Chemical Society
ISSN: 1530-6984
Official Date: 6 January 2021
Dates:
DateEvent
6 January 2021Available
5 January 2021Accepted
Date of first compliant deposit: 19 January 2021
DOI: 10.1021/acs.nanolett.0c04023
Status: Peer Reviewed
Publication Status: In Press
Publisher Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.nanolett.0c04023
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDAustralian Research Councilhttp://dx.doi.org/10.13039/501100000923
Center of Excellence in Future Low Energy Electronics Technologies (FLEET)Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
Australian Government Research Training Program ScholarshipUniversity of Sydneyhttp://dx.doi.org/10.13039/501100001774
201604910910China Scholarship Councilhttp://dx.doi.org/10.13039/501100004543
EP/T027207/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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