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

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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 489-5.16 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 similar to 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.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-08
Language
English
Article Type
Article
Keywords

QUANTUM CAPACITANCE; LARGE-AREA; TRANSISTORS; MICROSCOPY; DEPOSITION; QUALITY; DEVICES; FILMS

Citation

NANO LETTERS, v.12, no.8, pp.3887 - 3892

ISSN
1530-6984
DOI
10.1021/nl300266p
URI
http://hdl.handle.net/10203/102969
Appears in Collection
EE-Journal Papers(저널논문)
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