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Graphene transistor clocked at 427 GHz [pdf]

pnas.org

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Re: Graphene transistor clocked at 427 GHz [pdf]

#11

Post by chad_oliver »

Filligree wrote: post #9
donquichotte wrote: post #3

Great. Now we can finally convert heat radiation (300GHz-430THz) to DC using 1mm long antennas and graphene transistor rectifiers.

I suppose we could, but why would we want to?

Solid state generators would be pretty cool.

Re: Graphene transistor clocked at 427 GHz [pdf]

#12

Post by tcoppi »

rkangel wrote: post #4

The interesting phrase here is "scalable fabrication". Like the many new battery technologies, there are many ways you can make next-gen transistors, but none of them yet has been manufacturable at large scale. To me, it's not the transistor that's impressive in modern technology it's the manufacturing process we use to make large scale silicon devices. It's those that are becoming increasingly hard to advance and th…

Funny, I've heard that one of the things making graphene exciting to industry is that it may be easy to adapt existing photolithographic processes to it. I don't know how true that is though.

Re: Graphene transistor clocked at 427 GHz [pdf]

#13

Post by donquichotte »

Filligree wrote: post #9
donquichotte wrote: post #3

Great. Now we can finally convert heat radiation (300GHz-430THz) to DC using 1mm long antennas and graphene transistor rectifiers.

I suppose we could, but why would we want to?

We would no longer be slaves to the Carnot cycle. Also, you don't need a temperature gradient anymore. Everything warmer than 0K emits thermal radiation. Think free energy for everyone.

Re: Graphene transistor clocked at 427 GHz [pdf]

#14

Post by alexwright »

Lewton wrote: post #5

What are transistors in current gen cpus clocked at?

Intel have their gate delay graphed with 22nm vs. 32nm (and also the switch to 3D gates)... but I'm not sure what the units used here are. It's on page 21 of this PDF: http://www.intel.co.uk/content/dam/www/public/us/en/document...

picoseconds maybe?

Edit: Yea, pico, I think. From another PDF on Intel tech: "At 15nm, the gate delay is 0.39psec, and for 10nm gate length, the gate delay has dropped to 0.11psec"

Re: Graphene transistor clocked at 427 GHz [pdf]

#15

Post by nknighthb »

donquichotte wrote: post #13
Filligree wrote: post #9

Earlier quoted context omitted.

I suppose we could, but why would we want to?

We would no longer be slaves to the Carnot cycle. Also, you don't need a temperature gradient anymore. Everything warmer than 0K emits thermal radiation. Think free energy for everyone.

Is this a plausible method of extracting useful amounts of energy, or are we talking about yoctowatts per cubic yottametre?

Re: Graphene transistor clocked at 427 GHz [pdf]

#16

Post by donquichotte »

nknighthb wrote: post #15
donquichotte wrote: post #13

Earlier quoted context omitted.

We would no longer be slaves to the Carnot cycle. Also, you don't need a temperature gradient anymore. Everything warmer than 0K emits thermal radiation. Think free energy for everyone.

Is this a plausible method of extracting useful amounts of energy, or are we talking about yoctowatts per cubic yottametre?

This look quite promising: http://en.wikipedia.org/wiki/Thermal_radiation#Selected_radi...

We're speaking of radiant heat fluxes in the > 1kW/m^2 range for a sunny day.

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