Question

In a p-n junction diode, what happens to the width of the depletion region when the forward bias is increased?

• A. It increases.
• B. It decreases.
• C. It remains the same.
• D. It first increases and then decreases.

Hint:

A forward bias reduces the potential barrier at the p-n junction, allowing current to flow and reducing the width of the depletion region.

Answer 1

The Correct Option is B

A p-n junction diode's depletion region forms from charge carrier diffusion, resulting in a mobile-charge-carrier-free zone. Forward biasing lowers the potential barrier and shrinks the depletion region's width. Increased forward bias strengthens the bias-induced electric field, overcoming the barrier and further reducing the depletion region's width. Consequently, increasing forward bias narrows the depletion region.