Conductivity of doped type semiconductor higher than pure semiconductor..

  

What is metallic bond?

Ans. The bonding between metal atoms in a crystal of pure metal is called as metallic bond.

Why is the conductivity of doped n-type semiconductor higher than that of pure semiconductor?

(i) n-type semiconductor is an extrinsic semi conductor (doped semiconductor) which contains increased number of electrons in the conduction band.

ii ) An n-type semiconductor is obtained by adding group 15 element to intrinsic semiconductor of group 14 element. e.g. doping of Si with P.

(iii) As a result of doping, there are more number of electrons (charge carriers) in the conduction band of the doped n-type semiconductor, than those in the pure semiconductor.

(iv) The electrons in the conduction band move under the influence of an applied potential and hence conductivity of the doped n-type semiconductor is higher.