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Question

When a forward is applied to a p-n junction, then what happens to the potential barrier $$V_{B}$$ and the width of charge depleted region x


A
VB increases , x decreases
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B
VB decreases ,x increases
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C
VB increase , x increases
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D
VB decreases ,x decreases
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Solution

The correct option is D $$V_{B}$$ decreases ,$$ x$$ decreases
The forward bias voltage opposes the potential barrier. Due to this, the potential barrier is reduced and hence the depletion layer becomes thin. The conduction across p-n junction takes place due to migration of majority carriers from one region to another. Hence, in forward biasing both $$V_B$$ and $$x$$ decreases.

Physics

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