Account for the Silicon is an insulator but silicon doped with phosphorus acts as a semiconductor.

Pure silicon doped with phosphorus is:

Define the term doping. Pure silicon is an insulator. Silicon doped with phosphorus is a semiconductor. Silicon doped with gallium is also a semi-conductor. What is difference between the two types of semi-conductors ?

Although pure silicon is an insulator, then how does it behave as semi-conductor on heating ?

Give reason : (a) Why is Frenkel defect found in AgCl ? (b) What is the difference between silicon doped with phosphorus and doped with gallium semi-conductors ?

Why is phosphours doped silicon a semi-conductor?

ZnO crystals on heating acquires the formuls Zn_(1+x)O . Or There is an increase in conductivity when silicon doped with phosphorus. Give reason.

Why does the conductivity of silicon increase upon doping with phosphorus ?

Give reasons Silicon doped with phosphorus, gives an n-type semiconductor, while p-type semiconductor is obtained when silicon is doped with gallium.

Why silicon carbide is used as an abrasive?