MHT CET 2024 Physics question

Not in JEE Advanced syllabus

If '' and '' are the number of electrons and number of holes respectively in a semiconductor heavily doped with phosphorus then

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

Phosphorus has five valence electrons, so it is a pentavalent donor impurity. Four of its electrons form covalent bonds with neighbouring silicon/germanium atoms and the fifth is almost free, so every phosphorus atom donates one conduction electron; the semiconductor becomes n-type. Heavy doping makes the electron

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Question ID VK-096774