Tuning the electrical properties of of complex oxides by field effect gating using ionic gels

• Applicant: Dr. Tanja Graf
• Subject Area: Solid State and Surface Chemistry, Material Synthesis
• Term: from 2011 to 2012
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 212470574

• Final Report Year: 2012

Final Report Abstract

In conclusion, we have provided compelling evidence that electrolyte gating in TiO2 crystals results from electric field induced migration of oxygen from the oxide surface into the ionic liquid that is strongly dependent on the crystal facet orientation. The suppression of any significant gating effect in the presence of pure oxygen furthermore indicates negligible electrostatic gating effects. These experiments however suggest a simple method for distinguishing electrostatic and electrochemical doping effects at oxide surfaces under electrolyte gating by saturating the ionic liquid with oxygen.