NEET 2019 Physics question

Not in JEE Advanced syllabus

For a p-type semiconductor, which of the following statements is true ?

(1)Electrons are the majority carriers and trivalent atoms are the dopants.
(2)Holes are the majority carriers and trivalent atoms are the dopants.Correct
(3)Holes are the majority carriers and pentavalent atoms are the dopants.
(4)Electrons are the majority carriers and pentavalent atoms are the dopants.

Answer: (2)

Solution

A p-type semiconductor is made by doping pure Si or Ge with trivalent (acceptor) impurities such as B, Al, Ga or In. Each acceptor atom has only three valence electrons, leaving one bond incomplete, i.e. a hole. Thus holes are the majority

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Question ID VK-092392