Question

When arsenic is added as an impurity to silicon, the resulting material is 

(a) n-type conductor 

(b) n-type semiconductor 

(c) p-type semiconductor 

(d) none of these. 

Answer 1

The correct option is (b) n-type semiconductor.

Explanation:

Arsenic is pentavalent, therefore when added with silicon it leaves one electron as a free electron. In this case the conduction of electricity is due to motion of electrons, so the resulting material is n-type semiconductor.