MHT CET 2023 Physics question

Not in JEE Advanced syllabus

When forward bias is applied to a p-n junction, then what happens to the potential barrier () and the width (X) of the depletion region?

(A) increase, X decreases
(B) decreases, X increase
(C) increase, X increase
(D) decreases, X decreasesCorrect

Answer: (D)

Solution

Under forward bias the external voltage opposes the built-in junction potential, so the effective barrier height decreases. The applied field pushes majority carriers towards the junction, neutralising some of the immobile ions, so the depletion region narrows (X

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Question ID VK-097391