NEET 2013 Physics question

Not in JEE Advanced syllabus

In a n-type semiconductor, which of the following statements is true -

(1)Electrons are majority carriers and trivalent atoms are dopants
(2)Electrons are minority carriers and pentavalent atoms are dopants
(3)Holes are minority carriers and pentavalent atoms are dopantsCorrect
(4)Holes are majority carriers and trivalent atoms are dopants

Answer: (3)

Solution

An n-type semiconductor is made by doping Si or Ge with a pentavalent impurity (P, As, Sb). Each dopant atom donates one extra free electron, so electrons are the majority carriers and holes (thermally generated) are the minority

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Question ID VK-091337