An external voltage is applied across a diode such that the n-side is positive and the p-side is negative. As a result,

(A) the barrier height decreases
(B) the barrier height increases
(C) the depletion region widens
(D) the depletion region width decreases
(E) no change in barrier height

Choose the correct answer from the options given below:

(B) and (C) only

The correct answer is Option (4) → (B) and (C) only

When the n-side is made positive and the p-side is made negative, the diode is said to be reverse biased.

In reverse bias:

→ Electrons are pulled away from the junction on the n-side and holes on the p-side are also pulled away.

→ The depletion region widens.

→ The potential barrier increases.

∴ Correct options: (B) and (C)