Journal article
Atomic-Scale Characterization of Oxide Thin Films Gated by Ionic Liquid
ACS applied materials & interfaces, Vol.6(19), pp.17018-17023
08 Oct 2014
PMID: 25188384
Abstract
Ionic liquids (ILs) have received considerable interest for use in electrostatic gating in complex oxide systems. Understanding the ionic liquid/oxide interface, and any bias-induced electrochemical degradation, is critical for the interpretation of transport phenomena. The integrity of the interface between ionic liquid 1-ethyl-3-methylimidazolium hexafluorophosphate and La1/3Sr2/3FeO3 under various biasing conditions was examined by analytical transmission electron microscopy, and we report film degradation in the form of an irreversible chemical reaction regardless of the applied bias. This results in an intermixing region of 4-6 nm at the IL/oxide interface. Electron energy loss spectroscopy shows La and Fe migration into the ionic liquid, resulting in secondary phase formation under negative bias. Our approach can be extended to other ionic liquid/oxide systems in order to better understand the electrochemical stability window of these device structures.
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Details
- Title
- Atomic-Scale Characterization of Oxide Thin Films Gated by Ionic Liquid
- Creators
- Andrew C. Lang - Drexel UniversityJennifer D. Sloppy - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAHessam Ghassemi - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USARobert C. Devlin - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USARebecca J. Sichel-Tissot - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAJuan-Carlos Idrobo - Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USASteven J. May - Drexel UniversityMitra L. Taheri - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAOak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Publication Details
- ACS applied materials & interfaces, Vol.6(19), pp.17018-17023
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Grant note
- N00014-11-1-0664; N00014-1101-0296 / Office of Naval Research ORNL's Center for Nanophase Materials Sciences (CNMS) Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991019167711104721
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- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology