Mar
30
2008

Is graphene the new silicon?

Graphene potentially 100x better than silicon

Graphene computer chips: The slightly darker purple area is the graphene, and the lighter purple is the substrate material (SiO2/Si).
Graphene computer chips: The slightly darker purple area is the graphene, and the lighter purple is the substrate material (SiO2/Si).Courtesy S. Cho and M. S. Fuhrer, University of Maryland
Graphene could replace silicon as the material of choice for many applications like high-speed computer chips and biochemical sensors.

Michael Fuhrer in a paper published online in Nature Nanotechnology explains that in graphene, the intrinsic limit to the mobility, a measure of how well a material conducts electricity, is higher than any other known material at room temperature.

If other extrinsic factors that limit mobility in graphene, such as impurities and lattice vibrations in the substrate on which graphene sits, could be eliminated, the intrinsic mobility in graphene would be more than 100 times higher than silicon.

The low resistivity and extremely thin nature of graphene makes it ideal for applications like touch screens, photovoltaic cells, and chemical and biochemical sensors. The research group was led by principal investigator Michael Fuhrer of the University of Maryland's Center for Nanophysics and Advanced Materials and the Maryland NanoCenter.

Better than silver or gold

Fuhrer said the electrical current in graphene is carried by only a few electrons moving much faster than the electrons in a metal like silver.

"Our current samples of graphene are fairly 'dirty' due to some extraneous sources of resistivity,"
"Once we remove that dirt, graphene, at room temperature, should have about 35 percent less resistivity than silver, the lowest resistivity material known at room temperature."

Roadmap for progress

Because graphene is only one atom thick, current samples must sit on a substrate, in this case silicon dioxide. The electron mobility within the graphene is effected by the substrate. Trapped electrical charges in the silicon dioxide (a sort of atomic-scale dirt) and vibrations of the silicon dioxide atoms can also have an effect on the graphene which are stronger than the effect of graphene's own atomic vibrations.

"We believe that this work points out the importance of these extrinsic effects, and creates a roadmap for finding better substrates for future graphene devices in order to reduce the effects of charged impurity scattering and remote interfacial phonon scattering." Fuhrer said.

Source:University of Maryland news release

Your Comments, Thoughts, Questions, Ideas

john w clark's picture
john w clark says:

I have felt for years that graphene would be a wonderful conductor and perhaps even a super conductor purely because of the fact that all of the bonds are equie distant and thus all path through the material are of equal resistance. This leads to unifrm resistancs and flow of current through the material. The odd interfeerances seen in other conductors due to a lack of lattice rigidity are mostly eliminated with graphene. I would like to see another form of graphene produced having multiple layering of the graphene so that it would not need a subtrate and could possibly be uced as a superconductor at lower temps.

posted on Mon, 03/31/2008 - 2:20pm

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