Is graphene contacting with metal still graphene?

Nagashio, Kosuke; Moriyama, Takaaki; Ifuku, Ryota; Yamashita, Tadahiro; Nishimura, Tomonori; Toriumi, Akira

doi:10.1109/iedm.2011.6131475

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…The same tendency is also found in graphene under Pd. This is strong evidence that the characteristic conical points at the K space of graphene under those metals are not destroyed, which conflicts with the previous simulation prediction. Similar discord between experimental and calculation results has also been reported for contacts between carbon nanotubes and metal, and inconsistency among the calculations has been reported as well.…”

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confidence: 82%

Determination of Work Function of Graphene under a Metal Electrode and Its Role in Contact Resistance

et al. 2012

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Although the work function of graphene under a given metal electrode is critical information for the realization of high-performance graphene-based electronic devices, relatively little relevant research has been carried out to date. In this work, the work function values of graphene under various metals are accurately measured for the first time through a detailed analysis of the capacitance-voltage (C-V) characteristics of a metal-graphene-oxide-semiconductor (MGOS) capacitor structure. In contrast to the high work function of exposed graphene of 4.89-5.16 eV, the work function of graphene under a metal electrode varies depending on the metal species. With a Cr/Au or Ni contact, the work function of graphene is pinned to that of the contacted metal, whereas with a Pd or Au contact the work function assumes a value of ∼4.62 eV regardless of the work function of the contact metal. A study of the gate voltage dependence on the contact resistance shows that the latter case provides lower contact resistance.

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confidence: 82%

Determination of Work Function of Graphene under a Metal Electrode and Its Role in Contact Resistance

et al. 2012

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“…It is independent from back-gate voltage, which was believed to modulate the graphene channel, rather than the graphene underneath metal. However, Raman and transfer measurements show that carrier density of graphene underneath metal can be modulated, indicating graphene contacting metal is still graphene because of a weak interaction [72]. In their experiments, there exists residual photo-resistor between (PR) graphene and metal.…”

Section: Interface Impactmentioning

confidence: 99%

A Study on Graphene—Metal Contact

et al. 2013

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“…First, Pd differs from other more reactive metals ( i.e. , Ti, Ni, Cr, and Co) which favor oxidization or carbidization. , Remarkably, experimental observations reveal that Pd electrodes have a lower contact resistance than Ti electrodes when contacting graphene . In contrast, most transport simulations conclude that Ti is a superior contact over Pd. − Palladium in contact with metallic CNTs (m-CNTs) was claimed to achieve more reliable performance ( i.e.…”

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confidence: 99%

Realistic Metal–Graphene Contact Structures

et al. 2013

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The contact resistance of metal-graphene junctions has been actively explored and exhibited inconsistencies in reported values. The interpretation of these electrical data has been based exclusively on a side-contact model, that is, metal slabs sitting on a pristine graphene sheet. Using in situ X-ray photoelectron spectroscopy to study the wetting of metals on as-synthesized graphene on copper foil, we show that side-contact is sometimes a misleading picture. For instance, metals like Pd and Ti readily react with graphitic carbons, resulting in Pd- and Ti-carbides. Carbide formation is associated with C-C bond breaking in graphene, leading to an end-contact geometry between the metals and the periphery of the remaining graphene patches. This work validates the spontaneous formation of the metal-graphene end-contact during the metal deposition process as a result of the metal-graphene reaction instead of a simple carbon diffusion process.

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Is graphene contacting with metal still graphene?

Cited by 6 publications

References 8 publications

Determination of Work Function of Graphene under a Metal Electrode and Its Role in Contact Resistance

Determination of Work Function of Graphene under a Metal Electrode and Its Role in Contact Resistance

A Study on Graphene—Metal Contact

Realistic Metal–Graphene Contact Structures

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