Large conductance modulation of gold thin films by huge charge injection via electrochemical gating |
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Authors: | Daghero D Paolucci F Sola A Tortello M Ummarino G A Agosto M Gonnelli R S Nair Jijeesh R Gerbaldi C |
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Institution: | Dipartimento di Fisica, Politecnico di Torino, 10129 Torino, Italy. |
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Abstract: | By using an electrochemical gating technique with a new combination of polymer and electrolyte, we were able to inject surface charge densities n(2D) as high as 3.5×10(15) e/cm(2) in gold films and to observe large relative variations in the film resistance, ΔR/R', up to 10% at low temperature. ΔR/R' is a linear function of n(2D)-as expected within a free-electron model-if the film is thick enough (≥25 nm); otherwise, a tendency to saturation due to size effects is observed. The application of this technique to 2D materials might allow extending the field-effect experiments to a range of charge doping where large conductance modulations and, in some cases, even the occurrence of superconductivity are expected. |
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