Question

The region near the junction of an unbiased p-n junction diode is known as depletion layer. The layer is depleted of

• A. only negative ions
• B. electrons and holes
• C. both positive and negative ions
• D. only positive ions

Hint:

Depletion layer contains no free charge carriers, only fixed ions.

Answer 1

The Correct Option is B

Step 1: Understanding depletion layer.
In an unbiased p-n junction, electrons from the n-side and holes from the p-side diffuse across the junction and recombine.

Step 2: Charge carrier distribution.
Due to recombination, mobile charge carriers (electrons and holes) are removed from the junction region.
Only immobile ions remain in this region.

Step 3: Conclusion.
Thus, the depletion layer is depleted of free electrons and holes.