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Contact length scaling in graphene field-effect transistors
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10.1063/1.3691629
/content/aip/journal/apl/100/10/10.1063/1.3691629
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/10/10.1063/1.3691629
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Contact-induced doping into the adjacent graphene channel, with superimposed local electrostatic potential as indicated by the Dirac cone positions and global Fermi level. (b) Ti-graphene contact and the local electrostatic potential U(x) in graphene under the contact, with L T being the effective transfer length of the carriers from the metal to graphene.

Image of FIG. 2.
FIG. 2.

(Color online) Geometry and dc characteristics of graphene FETs. (a) SEM image showing a set of FETs with the same channel length L = 0.7 μm but different contact lengths. Scale bar: 2 μm. (b) Raman spectrum obtained using a 633 nm laser. (c) Transfer characteristics and (d) corresponding transconductance of graphene FETs with different contact length L C. (e) Peak transconductance for electron branch and extracted contact resistance (R C) as a function of contact length. (f) Gate-voltage-dependent conductivity of the channel after subtracting the contact resistance. The slope of the curve is related to the normalized transconductance.

Image of FIG. 3.
FIG. 3.

(Color online) (a) The contact length dependence of the transconductance for electron branch of three sets of devices, all with the same channel length of 0.7 μm. (b) Ratio between the transconductance for electron and hole branches and (c) the contact length dependence of the minimum conductivity, corresponding to (a). (d) The contact length dependence of the transconductance for electron branch with channel length L = 0.3 μm.

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/content/aip/journal/apl/100/10/10.1063/1.3691629
2012-03-05
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Contact length scaling in graphene field-effect transistors
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/10/10.1063/1.3691629
10.1063/1.3691629
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