Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

Within a p - n junction, the drift current is directed

Options

Afrom the p -side towards the n -side
Bfrom the n -side towards the p -side when the junction is forward-biased, and in the reverse direction when it
Cfrom the n -side towards the p -side
Dfrom the p -side towards the n -side when the junction is forward-biased, and in the reverse direction when it

Correct answer

C. from the n -side towards the p -side

Step-by-step solution

In a p - n junction, the depletion region contains uncovered positive donor ions on the n -side and negative acceptor ions on the p -side. This charge distribution creates an internal electric field directed from the n -side towards the p -side. The drift current is caused by the movement of minority charge carriers under the influence of this built-in electric field. Holes (minority carriers on the n -side) are swept towards the p -side, and electrons (minority carriers on the p -side) are swept towards the n -sid

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