A) an insulator
B) a conductor
C) p - type semiconductor
D) n - type semiconductor
Correct Answer: D
Solution :
In the extrinsic n-type semiconductor, the fifth electron of As-atom revolves around the donor atom inside the Si-crystal. As dielectric constant of silicon is very high, it is bound to the donor atom with a very small amount of energy, which is of the order of 0.045 eV. In terms of valance and conduction band, one can think that all such electrons (extrinsic carriers) create a donor energy level just below the conduction band.You need to login to perform this action.
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