Super Thin and Strong Graphene-based Circuits

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 carbon atoms, and hexagonal boron nitride, similarly thin sheets of repeating boron and nitrogen atoms. Researchers led by Jiwoong Park, assistant professor of chemistry and chemical biology, have invented a way to pattern single atom films of graphene and boron nitride, an insulator, without the use of a silicon substrate. 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.

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 semiconductor material, 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 integrated circuits by laying materials, one layer at a time, on flat silicon.

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 thin films 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.