Insulator-to-metal transition of WO3 epitaxial films induced by electrochemical Li-ion intercalation

Kohei Yoshimatsu, Takuto Soma, Akira Ohtomo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We investigated the systematic evolution of the structural and electronic properties of Lix WO3 films induced by Li-ion electrochemical reactions. Chronoamperometric Li-ion intercalation could control the Li content up to x > 0.5. The resistivity decreased abruptly with increasing x, and the films underwent an insulator-to-metal transition (IMT) within a range of 0.2 < x < 0.24, which was consistent with the IMT of cubic NaxWO3. X-ray diffraction analyses revealed the coexistence of tetragonal and cubic phases across the IMT, suggesting that the alkaline ion content was the primary factor in the metallic conductivity of the ReO3-type WO3 system.

Original languageEnglish
Article number075802
JournalApplied Physics Express
Volume9
Issue number7
DOIs
Publication statusPublished - 2016 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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