Explain how electrical neutrality is maintained in compounds showing Frenkel and Schottky
defect.
In compound showing Frenkel defect, ions just get displaced within the lattice. While in compounds showing Schottky defect, equal number of anions and Cations are removed from the lattice. Thus, electrical neutrality is maintained in both cases
Classify each of the following as either a p-type or n-type semi-conductor. a) Ge doped with In b) Si doped with P
(a) Ge is group 14 element and In is group 13 element. Therefore, an electron deficient hole is created. Thus semi-conductor is p-type. (b) Since P is a group 15 element and Si is group 14 element, there will be a free electron, thus it is n-type semi-conducto
CdCl2 will introduce impurity defect if added to AgCl crystal. Explain.
Ans.For every Cd++ ion dopped to the AgCl crystal, one cation vacancy is created.
The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases. Explain.
In metals with increase of temperature, the kernels start vibrating and thus offer resistance to the flow of electrons. Hence conductivity decreases. In case of semi-conductors, with increase of temperature, more electrons can shift from valence band to conduction band. Hence conductivity increases.
In compound showing Frenkel defect, ions just get displaced within the lattice. While in compounds showing Schottky defect, equal number of anions and Cations are removed from the lattice. Thus, electrical neutrality is maintained in both cases
Classify each of the following as either a p-type or n-type semi-conductor. a) Ge doped with In b) Si doped with P
(a) Ge is group 14 element and In is group 13 element. Therefore, an electron deficient hole is created. Thus semi-conductor is p-type. (b) Since P is a group 15 element and Si is group 14 element, there will be a free electron, thus it is n-type semi-conducto
CdCl2 will introduce impurity defect if added to AgCl crystal. Explain.
Ans.For every Cd++ ion dopped to the AgCl crystal, one cation vacancy is created.
The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases. Explain.
In metals with increase of temperature, the kernels start vibrating and thus offer resistance to the flow of electrons. Hence conductivity decreases. In case of semi-conductors, with increase of temperature, more electrons can shift from valence band to conduction band. Hence conductivity increases.
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