Question

When is depletion region?

Answer 1

In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating regionwithin a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away

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Answer 2

Haha told you ...The region between P side and N side which compensate +be and -ve charge near the junction is called depletion region