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(D) photodiode is a special type of $p-n$ junction diode that is fabricated with a transparent window to allow light to fall on the diode.It is operat

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which is always operated in reverse bias.

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(D) photodiode is a special type of $p-n$ junction diode that is fabricated with a transparent window to allow light to fall on the diode.It is operated under reverse bias conditions.When light with energy $h
u$ greater than the energy gap $E_g$ of the semiconductor is incident on the diode,electron-hole pairs are generated.Due to the electric field at the junction,these charge carriers are separated before they can recombine,resulting in a current flow in the external circuit.The magnitude of this photo-current depends on the intensity of the incident light,not significantly on the reverse bias voltage once a certain threshold is reached.Therefore,the correct statement is that it is always operated in reverse bias.

$A$ photodiode is a device

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