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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, 21 (2). pp. 995-1002. doi:10.1021/acs.nanolett.0c04023
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WRAP-Anisotropic-ion-migration-electronic-conduction-van-der-Waals-ferroelectric-CuInP2S6-Alexe-2021.pdf - Accepted Version - Requires a PDF viewer. Download (3265Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/acs.nanolett.0c04023
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 | ||||||||||||||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > 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: | 27 January 2021 | ||||||||||||||||||
| Dates: |
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| Volume: | 21 | ||||||||||||||||||
| Number: | 2 | ||||||||||||||||||
| Page Range: | pp. 995-1002 | ||||||||||||||||||
| DOI: | 10.1021/acs.nanolett.0c04023 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | 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: |
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