Question

How does the width of depletion region range when the function is forward bias?

Answer 1

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Reverse bias. Under reverse bias (applying a negative voltage to the P-side with respect to the N-side), the potential drop (i.e., voltage) across the depletion region increases. Essentially, majority carriers are pushed away from the junction, leaving behind more charged ions.
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Answer 2

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depletion region is always present in the diode but its width depends on the nature of bias.

☆$\green {VISHU\:PANDAT}$☆

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