question

what is photo diode ? briefly explain its working and draw its v-i characteristics.

 

 

 

 

 

 

a photodiode is a special type of p-n junction diode fabricatedwith a transparent windowto 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-igraph:-