Describe the working principle of photodiode with proper diagram.
in Elements of Electronics by

1 Answer

0 like 0 dislike

Diagram of photo diode :

Working principle of photo diode :  When photons of energy greater than 1.1 eV hit the diode, electron-hole pairs are created. The intensity of photon absorption depends on the energy of photons – the lower the energy of photons, the deeper the absorption is. This process is known as the inner photoelectric effect. If the absorption occurs in the depletion region of the p-n junction, these electron hole pairs are swept from the junction - due to the built-in electric field of the depletion region. As a result, the holes move toward the anode and the electrons move toward the cathode, thereby producing photocurrent. 

Related questions

1 answer
2 answers
1 answer

9,136 questions

7,896 answers


3,234 users