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[Nature] Nanoscale wires defy quantum predictions - Page 3

post #21 of 22
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Originally Posted by DuckieHo View Post

Resistence does not change.... but does the rate of electromigration increase?

Yes, but it is really a multi-level problem. Electromigration is really just quantum tunneling. Tunnelling happens constantly with the principal that if you walk into a wall enough times eventually the probability exists that you will go through the wall without changing it. What can raise the probability is the amount of energy each attempt has and how small the area you are trying to go through.

Thus when reducing the size, you are effectively increasing the power in the piece (same voltage/current through smaller structure). Thus the rate of tunneling would increase both for the reduced size and higher effective power. In order to reduce the tunneling, you would need to passivate the surface to stop external sources of tunneling (core/shell nanowires) as well as decrease the voltage needed to run the transistors.

We may find that we can't increase the speed as we go to smaller sizes because we might have to decrease the voltages so low that higher speeds would simply be unstable. There aren't yet test devices made with sizes less than 5nm (that I know of), but some of the computational work in the literature suggests that tunneling may be a force to be reckoned with.
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post #22 of 22
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Didn't know this, I hope he actually pushes them (perhaps down some stairs if they don't push themselves) instead of asking his ghost to do it :-D
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