Which of the following statements are true about semiconductors?

Options

A. Silicon doped with an 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 on n-type semiconductor.

Answer

B,C

Explanation

Silicon (valence electron-4) doped with electron rich impurity is an n-type semiconductor due to e trea electron and the delocalised electrons increase the conductivity of doped silicon.