The region near the junction of an unbiased $\mathrm{p}-\mathrm{n}$ junction diode is known as depletion…

The region near the junction of an unbiased $\mathrm{p}-\mathrm{n}$ junction diode is known as depletion layer. The layer is depleted of
  1. only negative ions.
  2. electrons and holes.
  3. both positive and negative ions.
  4. only positive ions.

Solution

The region near the junction of an unbiased junction diode, known as the depletion layer, is depleted of mobile charge carriers (electrons and holes). In the depletion region, the free electrons from the n-type region combine with holes from the p-type region, leaving behind immobile ions. (2) electrons and holes. *

Asked in: MHT CET 2020 (12 Oct Shift 2)

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