Semiconductor

brad sue

26th February 2011 - 01:39 AM

hi, i would like to have some help with this problem:

Silicon is doped with 10^16 phosphorus atoms/cm^3.
At what temperature would the hole concentration be equal to 10% of the ionized impurity concentration?

I think I can use the equation for Nd+= Nd x e(-(Ef-Ed)/KT),
where Nd+ is the ionized donor concentration, Nd is the donor concentration, Ef the fermi level, Ed the donor energy.

I am not sure I am using the good equation, then I dont know how to find the Ef and Ed . i was not able to find or dont understand how to get the Ef and Ed.

thank you
brad

brad sue

26th February 2011 - 07:46 PM

Please can I have any suggestions ?

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