Why is the conductivity of n type semiconductor greater than that of P-type semiconductor even when both of these have the same level of doping ?
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Answer:
In spite of having same level of doping the conductivity of an n-type semiconductor is greater than p-type semiconductor because the charge carrier of a n-type semiconductor is electron which is faster to move than the hole which is the charge carrier of a p-type semiconductor.
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Even after same level of doping , the conductivity of n - type semiconductors are greater than p- type semiconductors because the n-type semiconductors have a large number of free electrons as charge carriers .
n - type semiconductors :
These type of semiconductors are formed when a pentavalent impurity is doped into a silicon or germanium crystal. The pentavalent impurity forms 4 bonds with the patent atom. The last electron from the impurity doesn't form a bond and is free to move.
Electrons have higher motility as a charge carrier and hence conductivity of this type of semiconductors is much higher.
p- type semiconductors:
These types of semiconductors are produced when a trivalent impurity is dropped into a silicon or germanium crystal. Deficiency of electrons from the impurity results in formation of holes which act as the charge carriers in these crystals.
Motility of holes is far less as compared to electrons , hence these semiconductors have lesser conductivity