Physics - Semiconductors Question with Solution | TestHub

A photodiode is operated in reverse bias mode. In reverse bias, the current that flows through the p-n junction is the reverse saturation current, which is primarily due to the drift of minority charge carriers across the junction.

When light of suitable frequency falls on the photodiode, additional electron-hole pairs are generated in or near the depletion region. This increases the concentration of minority carriers, which in turn increases the reverse current (photocurrent).

Therefore, the reverse current in a photodiode depends on the concentration of minority carriers.

Answer: concentration of minority carriers.