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cryogenic operation of semiconductor devices (Read 2027 times)
vivkr
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cryogenic operation of semiconductor devices
Jun 21st, 2006, 6:36am  
Hi,

I am just curious as to how Si chips are able to work down to very low temperatures (5K as used in IBM's experimental 500 GHz processor). Is there no "freezeout temperature" below which the available thermal energy is insufficient to free enough carriers from the donor and acceptor levels?

Thanks
Vivek
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Croaker
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Re: cryogenic operation of semiconductor devices
Reply #1 - Jun 21st, 2006, 10:57am  
That's a good question.  I guess I could check the textbooks, but I seem to  recall that it wouldn't take too much energy to put donor electrons into the conduction band.  Although, the number of intrinsic carrier pairs from thermal generation would be quite low.
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