New technique could mean super thin, strong graphene-based circuits

Aug 29, 2012 by Anne Ju
Schematic illustration of single-atom-thick films with patterned regions of conducting graphene (gray) and insulating boron nitride (purple-blue).

(Phys.org)—Integrated circuits, which are in everything from coffeemakers to computers and are patterned from perfectly crystalline silicon, are quite thin—but Cornell researchers think they can push thin-film boundaries to the single-atom level.

Their materials of choice are graphene, single atom-thick sheets of repeating , and hexagonal boron nitride, similarly thin sheets of repeating boron and . Researchers led by Jiwoong Park, assistant professor of chemistry and , have invented a way to pattern single atom films of graphene and boron nitride, an insulator, without the use of a . The work is detailed in an article in the journal Nature, published online Aug. 30.

The technique, which they call patterned regrowth, could lead to substrate-free, atomically thin circuits—so thin, they could float on water or through air, but with tensile strength and top-notch electrical performance.

"We know how to grow graphene in single atom-thick films, and we know how to grow boron nitride," Park said. "But can we bring them together side and side? And when you bring them together, what happens at their junctions?"

As it turns out, researchers' patterned regrowth, which harnesses the same basic photolithography technology used in silicon wafer processing, allows graphene and boron nitride to grow in perfectly flat, structurally smooth films—no creases or bumps, like a well-knitted scarf—which, if combined with the final, yet to be realized step of introducing a , could lead to the first atomically thin integrated circuit.

Simple really is beautiful, especially in the case of thin films, because photolithography is a well-established technique that forms the basis for making by laying materials, one layer at a time, on flat silicon.

Patterned regrowth is a bit like stenciling, Park said. He and colleagues first grew graphene on copper and used photolithography to expose graphene on selected areas, depending on the desired pattern. They filled that exposed copper surface with boron nitride, the insulator, which grows on copper and "fills the gaps in very nicely."

"In the end, it forms a very nice cloth you just peel off," Park said.

The research team, which includes David A. Muller, professor of applied and engineering physics, is working to determine what material would best work with graphene-boron nitride to make up the final semiconducting layer that could turn the films into actual devices.

The team was helped by already being skilled at making graphene—still relatively new in the materials world—as well as Muller's expertise in electron microscopy characterization at the nanoscale. Muller helped the team confirm that the lateral junctions of the two materials were, indeed, smooth and well connected.

The paper's co-first authors were chemistry graduate student Mark Levendorf and postdoctoral associate Cheol-Joo Kim, who fabricated the graphene and samples and also performed the patterned regrowth at the Cornell NanoScale Science and Technology Facility.

The work was supported primarily by the Air Force Office of Scientific Research, and the National Science Foundation through the Cornell Center for Materials Research.

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sennekuyl
not rated yet Aug 29, 2012
Does boron nitrate enable graphene to be 'turned off'?
sirchick
not rated yet Aug 29, 2012
What kind of power can a potential Graphene CPU in a home PC generate compared to current silicon ? Also would they be power hungry / very hot like silicon ?
antialias_physorg
not rated yet Aug 30, 2012
The comparison is hard because while the electron mobility in graphene is 100 times higher than in silicon that's only half of the story. As soon as you pattern graphene or add other materials the values change, so it's very dependent on what you do with it (even on the substrate it's on).
IBM has made a graphene transistor capable of 155GHz but they are rather large compared to silicon transistors.
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