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Question

Why does depletion layer decrease in forward bias?


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Solution

Depletion region

  1. It is a thin layer on both sides of a P-N junction that has immobile ions in the absence of charge carriers.

Forward bias

  1. A P-N junction is said to be forward-biased if the negative terminal of the battery is connected to N-side and the positive terminal is connected to the P-side.
  2. In forward bias, the voltage drop across both sides of the P-N junction is small.
  3. During forward bias, the built-in electric field and applied electric field are in opposite directions.
  4. So their resultant will be less than the built-in electric field. Thus a thinner and less resistive depletion layer is created.

Thus, the depletion layer decrease in forward bias.


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