Question

Why phosphorus doped silicon is a semiconductor?

Answer 1

Phosphorus being a pentavalant atom has one unpaired electron left after bonding with four other silicon atoms. Due to this unpaired electron the no. of electrons as charge carriers increases making the resultant semi conductor a n-type semiconductor. 

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Answer 2

Answer:

silicon is 14th group member and P is 15th group member hence when P is doped in Si then it it generates an extra electron which increase the conductivity of the semi conductor