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23 April 2024

» arxiv » 1108.3099

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Large conductance modulation of gold thin films by huge charge injection via electrochemical gating
D. Daghero ; F. Paolucci ; A. Sola ; M. Tortello ; G.A. Ummarino ; R.S. Gonnelli ; Jijeesh R. Nair ; C. Gerbaldi ;
Date:	15 Aug 2011
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 imes 10^15 e/cm^2 in gold films and to observe large relative variations in the film resistance, DeltaR/R’, up to 10% at low temperature. DeltaR/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 will allow extending the field-effect experiments to a range of charge doping where giant conductance modulations and, in some cases, even the occurrence of superconductivity are expected.
Source:	arXiv, 1108.3099
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