Which of the following statements are not correct? (A) Diode is a combination of \(n\)-type and p-type…
Which of the following statements are not correct?
(A) Diode is a combination of \(n\)-type and p-type semiconductors.
(B) Silicon or germanium is electron rich impurity.
(C) Phosphorus and arsenic are electron deficient impurities.
(D) Schottky defect decreases the density of the crystal.
B, C
A, D
C, D
A, C
Solution
Among the given statements, (B) and (C) are incorrect. Their correct explanations are as follows:
(B) Silicon or germanium belong to group 14, so they can be used as semiconductors.
(C) Phosphorus and arsenic belong to group 15, so they have 5 valence electrons. Out of 5 electrons, 4 are used in covalent bonding with Si. The 5th electron is extra and hence become delocalised. Thus, they are electron rich impurities.