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Insulator to metal transition in WO3 induced by electrolyte gating

Leng, X., Pereiro, J., Strle, J., Dubuis, G., Bollinger, A. T., Gozar, A., Wu, J., Litombe, N., Panagopoulos, C., Pavuna, D. and Bozovic, I. 2017. Insulator to metal transition in WO3 induced by electrolyte gating. npj Quantum Materials 2 , 35. 10.1038/s41535-017-0039-2

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Abstract

Tungsten oxide and its associated bronzes (compounds of tungsten oxide and an alkali metal) are well known for their interesting optical and electrical characteristics. We have modified the transport properties of thin WO3 films by electrolyte gating using both ionic liquids and polymer electrolytes. We are able to tune the resistivity of the gated film by more than five orders of magnitude, and a clear insulator-to-metal transition is observed. To clarify the doping mechanism, we have performed a series of incisive operando experiments, ruling out both a purely electronic effect (charge accumulation near the interface) and oxygen-related mechanisms. We propose instead that hydrogen intercalation is responsible for doping WO3 into a highly conductive ground state and provide evidence that it can be described as a dense polaronic gas.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Nature Research
ISSN: 2397-4648
Date of First Compliant Deposit: 3 July 2017
Date of Acceptance: 11 June 2017
Last Modified: 04 May 2020 16:45
URI: http://orca.cf.ac.uk/id/eprint/101992

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