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Electronic Devices & CircuitsPN Junction Diode

The depletion region of a PN junction mainly contains?

  • AOnly freely moving electrons
  • BOnly freely moving holes
  • CImmobile ionized donor and acceptor atoms
  • DNo electric field
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Correct Answer: C. Immobile ionized donor and acceptor atoms
Explanation: Carrier diffusion near the junction leaves uncovered fixed ionized donors and acceptors, forming the space-charge or depletion region.
Reference: Standard semiconductor electronics: PN junction
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