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 increases the conductivity of n-type semiconductor

Answer

b,c

Explanation

(a) is false because silicon doped with eletron 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.