Question Detail

PHY 102 Test Compilation PHY 102 10 Objective Question

Question

Which of the following is not true about doping of semiconductor?
Options
A doping with group III element leads to p-type semiconductor.
B doping with group V element leads to n-type semiconductor.
C doping with group III elements leads to excess holes in valency band.
D doping with group V elements leads to excess holes in the conduction band.
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

Let's evaluate each statement:A. Doping with group III elements (like Boron) creates acceptor impurities, which accept electrons and create holes, leading to p-type semiconductors. This statement is true.B. Doping with group V elements (like Phosphorus) creates donor impurities, which donate electrons, leading to n-type semiconductors. This statement is true.C. Group III elements are acceptors. They create a 'hole' in the valence band for an electron to jump into, hence creating excess holes in the valency band. This statement is true.D. Group V elements are donors. They have an extra valence electron that is loosely bound and can easily move into the conduction band, thus leading to excess electrons in the conduction band, not holes. Therefore, this statement is not true.

Hint

Understand the role of Group III (acceptor) and Group V (donor) elements in doping and their impact on carrier concentration in p-type and n-type semiconductors.

Question Info