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What happens to the depletion region and potential difference after diffusion of electrons and holes?

1. (a) Number of donors is more because electrons from –ve terminal of the cell pushes (enters) the n side and decreases the number of uncompensated pentavalent ion due to which potential barrier is reduced. The neutralised pentavalent atom are again in position to donate electrons.
2. (b) Depletion region and potential difference are now smaller.
3. (c) Solid dot = electron, Hollow circle = hole.
4. (d) Before diffusion and after diffusion of electrons and holes.

Correct answer: (b) Depletion region and potential difference are now smaller.

Solution

Diffusion of electrons and holes reduces the charge imbalance in the depletion region, leading to a smaller depletion width and potential difference.

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