Measurements of the sheet resistance and conductivity of thin epitaxial graphene and SiC films

Křupka, J.; Strupiński, Włodek

doi:10.1063/1.3327334

Cited by 109 publications

(78 citation statements)

References 5 publications

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“…A 13 GHz dielectric resonance oscillator (DRO) measurement (spot frequency) of multilayer graphene on SiC was made by Krupka, but the per layer conductance was not determined [13,14]. An on-chip coplanar waveguide measurement technique was recently employed to study single-layer graphene (SLG) up to 110 GHz [15].…”

Section: Introductionmentioning

confidence: 99%

Terahertz graphene optics

et al. 2012

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The magnitude of the optical sheet conductance of single-layer graphene is universal, and equal to e 2 /4ħ (where 2πħ = h (the Planck constant)). As the optical frequency decreases, the conductivity decreases. However, at some frequency in the THz range, the conductivity increases again, eventually reaching the DC value, where the magnitude of the DC sheet conductance generally displays a sample-and doping-dependent value between ~e 2 /h and 100 e 2 /h. Thus, the THz range is predicted to be a non-trivial region of the spectrum for electron transport in graphene, and may have interesting technological applications. In this paper, we present the first frequency domain measurements of the absolute value of multilayer graphene (MLG) and single-layer graphene (SLG) sheet conductivity and transparency from DC to 1 THz, and establish a firm foundation for future THz applications of graphene.

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Section: Introductionmentioning

confidence: 99%

Terahertz graphene optics

et al. 2012

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“…There have been some studies on measuring the conductivity of graphene based on resonance methods that obtained results in the microwave frequency range. 9,10 Unfortunately, these methods only works at certain discrete frequencies and cannot easily be used to obtain frequency-dependent conductivity properties in a broad frequency band. In our previous work, the relative permittivity of graphene was determined up to 6 GHz using a graphene-on-CPW structure.…”

confidence: 99%

Characterization of CVD graphene permittivity and conductivity in micro-/millimeter wave frequency range

Wu²,

Kang

et al. 2016

AIP Advances

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The permittivity and conductivity of chemical vapor deposited monolayer graphene are investigated up to 40 GHz. The characterization method is based on a coplanar waveguide transmission line structure that is fabricated on a multilayer substrate of Si/SiO2/graphene/Al2O3 from the bottom up. The effective relative permittivity of the coplanar waveguide transmission line is extracted using Thru-Reflect-Line calibration and scattering parameter measurements, and then the relative permittivity and corresponding conductivity of graphene are characterized using partial capacitance techniques. The results demonstrate that the conductivity and sheet resistance are remarkably frequency-dependent and that the complex relative permittivity is consistent with the Drude model.

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“…In the latter, we have shown that electrical conductivity arises due to hopping of electrons between the localized states provided by the graphene sheets. From the above, it can be seen that so far electrical conductivity involving graphene has been investigated either in its percolative configuration [15] or in a composite structure [10,11]. In the present work, our objective is to study the conduction mechanism in a graphene based polymer composite, where the graphenes will be at close proximity to each other but not in percolative configuration.…”

Section: Introductionmentioning

confidence: 99%

Tunneling conduction in graphene/(poly)vinyl alcohol composite

Mitra¹,

Banerjee²,

Chakravorty³

2013

Journal of Applied Physics

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Graphene/(Poly)vinyl alcohol (PVA) composite film with thickness 60µm were synthesized by solidification of a PVA solution comprising of dispersed graphene nanosheets. The close proximity of the graphene sheets enables the fluctuation induced tunneling of electrons to occur from one sheet to another. The dielectric data show that the present system can be simulated to a parallel resistance-capacitor network. The high frequency exponent of the frequency variation of the ac conductivity indicates that the charge carriers move in a two-dimensional space. The sample preparation technique will be helpful for synthesizing flexible conductors.

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Measurements of the sheet resistance and conductivity of thin epitaxial graphene and SiC films

Cited by 109 publications

References 5 publications

Terahertz graphene optics

Terahertz graphene optics

Characterization of CVD graphene permittivity and conductivity in micro-/millimeter wave frequency range

Tunneling conduction in graphene/(poly)vinyl alcohol composite

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