JEE Main 2021PhysicsSemiconductorsEasyMCQ

JEE Main 2021 — Semiconductors Question with Solution

JEE Main 2021 (25 Feb Shift 2)

Question

For extrinsic semiconductors; when doping level is increased;

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Show full solutionCorrect option: D
Correct answer
DFermi-level of p- type semiconductors will go downward and Fermi-level of n- type semiconductor will go upward.

Step-by-step explanation

In n-type semiconductor pentavalent impurity is added. Each pentavalent impurity donates a free electron. So the Fermi-level of n -type semiconductor will go upward.
& In p-type semiconductor trivalent impurity is added. Each trivalent impurity creates a hole in the valence band. So the Fermi-level of p-type semiconductor will go downward.

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About this question

This is a previous-year question from JEE Main 2021, covering the Semiconductors chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.