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Question 20217
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Semiconductors: Depletion Region MCQ

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Depletion RegionEasyQuestion 20217

Question

The depletion region in an unbiased p-n junction contains:
  1. A
    Many free electrons
  2. B
    Many free holes
  3. C
    No free charge carriers — only fixed donor/acceptor ions
    Correct
  4. D
    Both free electrons and holes in equal numbers

Correct answer

No free charge carriers — only fixed donor/acceptor ions

Explanation

Near the junction, electrons from n-side and holes from p-side recombine → carriers are depleted → only fixed positive donor ions (n-side) and negative acceptor ions (p-side) remain → the depletion/space charge region. This region has a built-in electric field directed from n to p.

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