Question

Which of the following statements are true about semiconductors ?

(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 1

Answers: (b), and (c)

Silicon doped with an electron-rich impurity is an n-type semiconductor. The conductivity of the n-type semiconductor is due to the presence of free electron delocalisation of electrons increases the conductivity of doped silicon due to the increase in the mobility of the electron.