Exercise2
Question 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.
1) Ge belongs to group 14 & In belongs to group 13, In has 3 valence electrons while Ge has 4 valence elecltron.On replacement an electron deficient hole was created ,therefore it is a p-type semi conductor.
2) B belongs to group 13 with 3 valence electrons & Si belongs to group 14 with 4 valence electrons.therefore on replacement there will be a free electron & it is n-type semiconductor.
