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Updated: Apr 18, 2026
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
12.1K
Giant reversible, facet-dependent, structural changes in a correlated-electron insulator induced by ionic liquid
Jaewoo Jeong1, Nagaphani B Aetukuri1, Donata Passarello2
1International Business Machines Almaden Research Center, San Jose, CA 95120;
Summary
Ionic liquid gating induces giant, reversible structural expansion in vanadium dioxide (VO2) films, causing metallization. These changes depend on the VO2 crystal facet and oxygen ion mobility.
Area of Science:
- Condensed matter physics
- Materials science
- Oxide electronics
Background:
- Correlated electron oxides exhibit unique electrical properties.
- Vanadium dioxide (VO2) shows a temperature-driven insulator-to-metal transition near room temperature.
- Ionic liquid gating can induce metallization in VO2 thin films.
Purpose of the Study:
- Investigate the structural changes accompanying ionic liquid gating-induced metallization in VO2.
- Understand the mechanism and reversibility of these structural transformations.
- Determine the influence of crystal facet on the gating effect.
Main Methods:
- In situ synchrotron X-ray diffraction
- In situ synchrotron X-ray absorption spectroscopy
- Ionic liquid gating of epitaxial VO2 thin films
Main Results:
- Ionic liquid gating causes a giant lattice expansion (up to ~3%) in VO2 films, significantly larger than thermal metallization (~0.3%).
- These large-scale structural changes are fully reversible upon gating reversal.
- The observed metallization and structural changes are strongly dependent on the VO2 crystal facet, linked to oxygen ion mobility.
Conclusions:
- Electric-field-induced structural changes play a crucial role in the metallization of VO2.
- Oxygen ion motion along specific crystallographic directions facilitates these reversible transformations.
- This work provides insights into the mechanism of ionic liquid gating in correlated oxides and its potential for device applications.
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