Ans :- n-type Semi-Conductor

It is an extrinsic semi-conductor which is obtained by doping the impurity atoms of Vth group of the periodic table to the pure Ge and Si semi-conductor.

The impurity atoms added, provide extra electrons in the structure and are called donor atoms.

The electrons are majority carriers and holes are minority carriers.

The electrons density (ne) is much greater than the hole density (nh) i.e.>> nh.

The donor energy level is close to the conduction band and for away from the valence band.

The Fermi-energy level lies in between the donor energy level and conduction band.

P-type Semi-Conductor

It is an extrinsic semi-conductor which is obtained by doping the impurity atoms of III group of the periodic table to the pure Ge and Si semi-conductor.

The impurity atoms added, create vaccines of electrons (i.e. holes) in the structure and are called acceptor atoms.

The holes are majority carriers and electrons are minority carriers.

The holes density (nh) is much greater than the electrons density (ne) i.e.>> ne.

The acceptor energy level is close to the Valence band and for away from the Conduction band.

The Fermi-energy level lies in between the acceptor energy level and valence band.