Question

silicon doped with electron rich impurity forms ………. .
A. p-type semiconductor
B. n-type semiconductor
C. intrinsic semiconductor
D. insulator

Answer 1

Correct Answer - B
Silicon has four valence electrons. If it is doped with an electron rich impurity, the extra electron becomes delocalised and increase the conductivity. Since the increase in conductivity is due to negatively charged electron, hence it is called n-type semiconductor.