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GE2151-BASIC-ELECTRICAL-AND-ELECTRONICS-ENGINEERING-->View question

I n a p-n junction diode at equilibrium, which one of the following statements is NOT TRUE?

(A) The hole and electron diffusion current components are in the same direction.
(B) The hole and electron drift current components are in the same direction.
(C) On an average, holes and electrons drift in opposite direction.
(D) On an average, electrons drift and diffuse in the same direction.


Asked On2019-04-10 11:21:18 by:Rohit498

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On an average, electrons drift and diffuse in the same direction.

Since the concentration of holes on the p-side is much greater than that in the n-side, a very large hole diffusion current tends to flow across the junction from the p to the n material. Hence an electric field must build up across the junction in such a direction that a hole drift current will tend to flow across the junction from n-side to p-side in order to counterbalance the diffusion current. After depletion region is formed and electric field is set-up; holes on p-side and electrons on n-side move away from junction. However, diffusion current components (before formation of depletion region) and drift current components (after formation of depletion region) are in the same direction.

Answerd on:2019-06-20 Answerd By:Gaganpreet-Gandhi

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