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Originally Posted by bojan
Don't hold your breath just yet...
The beta of those transistors are still very low.. lower than 1 actually. Those guys just demonstrated that Graphene could be used ....
But before those transistors become really useful. they need to have gain at least 10.
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The transconductance of a MOSFET decides its gain. In currently available technologies, as you reduce the size of the MOSFET, the transconductance is reduced because dopant impurity starts to impact on electron mobility.
So, seeing as native graphene devices have two orders of magnitude higher mobility than Si or GaAs devices, I'd say there's pretty reasonable potential for tradeoffs when it comes to gain.
Anyway, for digital switching applications all you need is on/off. I'm not so sure analogue applications are where the playing field is (hence the gain may not be the primary factor). Speed is the primary performance criteria for digital switching apps, and reduced heating (due to resistance).
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And, they must be cheaper to manufacture...
So, before that happens... we still have silicon and GaAs (for 300GHz and up).
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Agreed. But the graphene transistors are now in the ballpark and orders of magnitude better in switching performance up to 300GHz. (That limit will improve .. it always has ..
Moore's Law).
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What will REALLY revolutionise the computer industry one day will be parallel processing (in other words: software. We still do not have proper compilers that can produce reliable code for more that 4 cores)..
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This software is required no matter what technology substrate you use.
The real revolution will be quantum computing. That's further out though .. and graphene substrate will be available in shorter timeframes. Not sure what they'll run quantum computing on .. it seems to be intrinsically linked with photonics developments.
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otherwise with graphene processors we will only have 100x bigger and equally unreliable and slow windows OS or equivalent, just what we have today.
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I'm not sure I get the 100x bigger ??
Cheers
PS: Good to hear from you on this one, Bojan.
