Question

Explain the importance of the depletion region in a pn-junction diode. ​

Answer 1

Explanation:

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Answer 2

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(1) The region of the junction between a p-type laver and an n-type layer within a single semiconducting crystal is depleted of free (or mobile) charge carriers. This is called the depletion region or depletion layer.

(2) When the formation of the junction takes place, electrons diffuse from the n-side to the p-side of the junction and holes diffuse from the p-side to the n-side of the junction.

(3) This results in the negatively charged acceptor ions in the p-type region as well as positively charged donor ions in the n-type region near the junction.

(4) The potential barrier thus developed, prevents continuous flow of charges across the junction. A state of electrostatic equilibrium is thus reached across the junction.

(5) In the region of a potential barrier, free charge carriers cannot exist. This creates a depletion region.

(6) In the absence of depletion region, all the majority charge carriers from the n-region i.e. electrons will diffuse to the p-region and combine with the holes in that region. This will result in the decreased efficiency of the pn- junction.

(7) The formation of the depletion layer across the junction is important to limit the number of majority charge carriers crossing the junction.