With what considerations in view is a photodiode fabricated? Explain its working with the help of a suitable diagram. With the help of V-I characteristics, state how photodiode is used to detect optical signals.

 

 

Answers (1)
S safeer

A photodiode is fabricated with a transparent window to allow light to fall on the diode and the generation of electron and hole pairs takes place in or near the depletion region of the diode.

Working of a photodiode:-
when the photodiode is illuminated with light of suitable frequency, then electron and holes pairs are generated near depletion region due to its specific fabrication, the junction potential separates electrons n-side and holes reaches to p-side and current flows across the photodiode when connected with the load.
The V-I graph:-

If reverse bias is applied across the photodiode, the photocurrent changes with the change in intensity of light. Hence it can be used to detect the optical signals.

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