Question

Depletion layer in a pn junction consists of
(a)electron
(b)holes
(c)positive and negative ions fixed in their position
(d)both electrons
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Answer 1

Explanation:

When a p−n junction is formed, some of the free electrons in the n region diffuses across the junction and combine with holes to form negative ions. In doing so they leave behind positive ions at the donor impurity sites. Similarly, holes from p side diffuse to the n side and thus form a layer called diffusion layer at the junction.

So the depletion region is caused by the diffusion of charge carriers.

Answer 2

holes is the correct answer

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