Question

In a photodiode, when there is no incident light, the reverse current is almost negligible and is called

• A. Zener current
• B. Photocurrent
• C. Dark current
• D. Forward current

Answer 1

The correct option is C Dark current

Dark current is the relatively small electric current that flows through a photo - diode even when there are no photons falling on the device. Dark current is due to the random generation of electrons and holes within the depletion region because of heat or thermal excitation.

Hence, option $\left(\text{D}\right)$ is correct.