Question

Which of the following statements are true about semiconductors

• 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 increases the conductivity of type semiconductor

Answer 1

Answer: (B), (C)

The correct options are
B Silicon doped with an electron rich impurity is an n-type semiconductor
C Delocalised electrons increase the conductivity of doped silicon

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