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Title: Insulator to metal transition in WO 3 induced by electrolyte gating

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 WO 3 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 WO 3 into a highly conductive ground state and provide evidence that it can be described as a dense polaronic gas.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4] ;  [1] ;  [5] ;  [1] ;  [6] ;  [7] ;  [8] ; ORCiD logo [9]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Jozef Stefan Institute (Slovenia)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Ecole Polytechnique Federale de Lausanne (Switzerland)
  5. Yale Univ., New Haven, CT (United States)
  6. Harvard Univ., Cambridge, MA (United States)
  7. Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
  8. Ecole Polytechnique Federale de Lausanne (Switzerland)
  9. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Publication Date:
Report Number(s):
BNL-114087-2017-JA
Journal ID: ISSN 2397-4648; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1376146