Which of the following statements are true about semiconductors?

Options

A. Silicon doped with electron rich impurity is a p-type semiconductor.
B. Silicon doped with an electron rich impurity is an n-type semiconductor.
C. Delocalised electrons increase the conductivity of doped silicon.
D. An electron vacancy increase the conductivity of n-type semiconductor.

Answer

B, C

Explanation

(a) is false because silicon doped with electron rich impurity is n-type semiconductor.
(d) is false because conductivity of n-type semiconductor increases due to extra electrons and not due to vacancy.