CBSE 2022 · Region 2 · Set 1 · Q1 · 2 marks
Explain the formation of depletion region in a p-n junction.
Marking-scheme solution
When p-type semiconductor is chipped with n-type semiconductor, $\displaystyle \mathrm{e}^{-}$from the n-side diffuse towards p-side and holes from p-side diffuse towards n-side leaving behind a layer of immobile +ve ions on n-side and immobile -ve ions on p-side leading to formation of depletion layer.
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