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Graphene transistors can�t be turned off, won�t replace silicon in processors

Jan 28, 2011, 15:04 (1 Talkback[s])
(Other stories by Matthew Humphries)

[ Thanks to An Anonymous Reader for this link. ]

"Over the last three years we've been hearing some impressive claims about what the material graphene can do for the future of processors. Graphene is a one-atom thick sheet of carbon atoms that looks like a chicken coup-like mesh. IBM has demoed a 26GHz graphene-based transistor and MIT has unveiled a graphene chip capable of a 1,000GHz suggesting it is the future and a replacement for silicon.

"But the latest news out of IBM is that graphene won't replace silicon completely. For it to do so graphene would have to be capable of replacing the transistors used in processors. A transistor needs to have two states: on and off. The problem is that graphene does not have an off state and it cannot be switched off completely. This means the energy state gap is very small making it unsuitable for use as a transistor in a CPU at the moment."

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