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Draw the I-v Characteristics of a Photo -diode. What is Meant by Dark Current? - Applied Physics 1

Draw the I-V characteristics of a photo -diode. What is meant by dark current?

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Solution

DARK CURRENT:

dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photo diode, 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. It is referred to as reverse bias leakage current in non- optical devices and is present in all diodes. Physically, dark current is due to the random generation of electrons and holes within the depletion region of the device.

Concept: Applications of semiconductors : Rectifier diode, LED, Zener diode, Photo diode, Photovoltaic cell, BJT, FET, SCR., MOSFET
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