Q 20: Classify each of the following as being either a p–type or an n–type semiconductor: (i) Ge doped with In (ii) B doped with Si.

Q 20: Classify each of the following as being either a p–type or an n–type semiconductor:

(i) Ge doped with In             (ii) B doped with Si.

Solution:

(i) Ge is a 14^th group element and In is a 13^th group element .When 14^th group element is doped with In a 13^th group element, a electron deficit hole created .Hence Ge doped with In will generate p–type semiconductor.

(ii)B is a 13^th group element and Si is a 14^th group element .When 13^th group element is doped with In a 14^th group element, created hole will generate n–type semiconductor.