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Which of the following statements are no...

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 and electron deficient impurities.
(D) Schottky defect decreases the density of the crystal.

A

B, C

B

A, D

C

C, D

D

A, C

Text Solution

Verified by Experts

The correct Answer is:
A
Among the given statements, (B) and (C ) are incorrect. Their correct explanation 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.
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