In the depletion region of a diode.

Options

A. there are no mobile charges
B. equal number of holes and elections exist, making the regin neutal
C. recombination of holes and electrons has taken place
D. immobile charged ions exist.

Answer

A, B, D

Explanation

The space-charge regions on both the sides of `p - n` junction which has immobile ions and entirely lacking of any charge carries will form a region called depletion region of a diode. The number of ionized acceptors on the `p-`side equal the number of ionized donors on the `n-`side