Question

In figure, $V_0$ is the barrier potential across a p-n junction, when no battery is connected across the junction.

• A. 1 and 3 both correspond to forward bias of junction.
• B. 1 corresponds to reverse bias of junction and 3 corresponds to forward bias of junction.
• C. 1 corresponds to forward bias and 3 corresponds to reverse bias of junction.
• D. 1 and 3 both correspond to reverse bias of junction.

Answer 1

Answer: (B)

When p-n junction is forward biased, applied voltage opposes the barrier potential resulting decrease in barrier potential. When p-n junction is reverse biased, applied voltage supports the barrier potential resulting increase in barrier potential. Thus, curve 1 corresponds to reverse bias and curve 3 corresponds to forward bias.