Question

_______ current is the leakage current that flows through a photo diode with no input used in as light detectors.
1. Leakage
2. Dark
3. saturation current
4. Detection

Answer 1

Correct Answer - Option 2 : Dark

DARK CURRENT

• In physics and in electronic engineering, the dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons are entering the device;
• it consists of the charges generated in the detector when no outside radiation is entering the detector (the current the photodiode produces with no light hitting the diode).
• It is referred to as reverse bias leakage current in non-optical devices and is present in all diodes.
• Physically, the dark current is due to the random generation of electrons and holes within the depletion region of the device.

• The dark current is both temperature-dependent and voltage-dependent.
• Increasing temperature and/or increasing reverse bias increases the dark current.