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  • Explain potential barirrer and depletion region 

Explain potential barrier and depletion region.

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1. Depletion Region

When a p–n junction is formed:

  • Electrons from the n-region diffuse into the p-region.

  • Holes from the p-region diffuse into the n-region.

As they cross the junction, electrons and holes recombine with each other.

It is called depletion because it is depleted of free charge carriers (electrons and holes). It acts like an insulator.

2. Potential Barrier (or Barrier Potential)

Due to the immobile ions in the depletion region:

  • Negative ions on the p-side create a negative potential.

  • Positive ions on the n-side create a positive potential.

This produces an electric field across the junction. This electric field opposes further diffusion of electrons and holes.

The voltage developed across the depletion region because of this electric field is called the potential barrier.

Posted by

Saumya Singh

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