Graphene Chills Out

Graphene Chills Out - Electronics Featured Graphene

 

A theoretical model that explains how heat flows from could help improve the design of nanoscale devices, say A*STAR scientists.

A*STAR scientists have developed a theory that explains how heat flows from graphene, which could help improve the design of nanoelectronic devices

Graphene is a two-dimensional carbon crystal just one atom thick. This strong, electrically conductive material is being investigated for a vast array of applications, including electronic devices where graphene is laid on top of a substrate such as silica. Using graphene in this way can create devices that are much more compact than conventional electronic components, but the small size comes with a cost — electrical current flowing through graphene can generate a lot of waste heat. If this heat is not dissipated into the substrate, it can affect a device’s performance and longevity.

Zhun-Yong Ong and colleagues at the A*STAR Institute of High Performance Computing have developed the first theoretical model that accurately predicts the rate of heat dissipation. Their study exploited the idea that vibrations in the crystal lattice, called phonons, carry most of this heat across the boundary, and the flexing of the graphene sheet affects how these phonons behave.

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