Germanium or silicon becomes semiconductor due to
Chemical impurity
Schottky defect
Frenkel defect
Metal deficiency defect
Germanium and silicon behaves as semiconductor only when doped with some group 15 element like P or As.
Cations are present in the interstitial sites in ...........
(a) Frenkel defect (b) Schottky defect
(c) vacancy defect (d) metal deficiency defect
Difference between Schottky defect and Frenkel defect.