Impedance spectroscopy of encapsulated single graphene layers



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Schmidt, Rainer and Carrascoso Plana, Félix and Nemes, Norbert Marcel and Mompeán, Federico J. and García Hernández, Mar (2022) Impedance spectroscopy of encapsulated single graphene layers. Nanomaterials, 12 (5). ISSN 2079-4991

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In this work, we demonstrate the use of electrical impedance spectroscopy (EIS) for the disentanglement of several dielectric contributions in encapsulated single graphene layers. The dielectric data strongly vary qualitatively with the nominal graphene resistance. In the case of sufficiently low resistance of the graphene layers, the dielectric spectra are dominated by inductive contributions, which allow for disentanglement of the electrode/graphene interface resistance from the intrinsic graphene resistance by the application of an adequate equivalent circuit model. Higher resistance of the graphene layers leads to predominantly capacitive dielectric contributions, and the deconvolution is not feasible due to the experimental high frequency limit of the EIS technique.

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©2022 by the authors. Licensee MDPI
The authors wish to thank Gabriele Navickaite, Frank Koppens and Stijn
Goossens for sample preparation and Carmen Munuera for preliminary electrode depositions.

Uncontrolled Keywords:Ballistic transport; Contact; Resistance; Bandgap; Metals; Oxide; Single-layer Graphene; Impedance spectroscopy; Electrode resistance
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:71916
Deposited On:04 May 2022 14:09
Last Modified:04 May 2022 15:01

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