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⚛️ Physics  ·  Semiconductor Electronics  ·  NEET & JEE

When a p-n junction is reverse biased, the width of the depletion region:

Answer: increases.

  • A decreases
  • B becomes zero
  • C increases
  • D stays constant

Correct answer: C. increases

Explanation: Reverse bias pulls carriers away from the junction, widening the depletion region and raising the potential barrier.

Conductorconduction bandvalence bandbands overlapSemiconductorconduction bandvalence bandsmall gap (~1 eV)Insulatorconduction bandvalence bandlarge gap(> 3 eV)

Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.

Concept context

Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.

Read the full Semiconductor Electronics notes →