State working principle of photo diode. List out its three applications.
by

1 Answer

0 like 0 dislike

Diagram of photo diode : 

image

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 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. 


Applications principle of photo diode :  Cameras, Medical devices, Smoke detector, Optical communication devices, Position sensors, Bar code scanners, Automotive devices, Surveying instruments

by

Related questions

2 answers
0 answers
asked Aug 13 by Doyel | 22 views
1 answer
3 answers
1 answer
asked Sep 12, 2018 by anonymous1 | 2 views
1 answer
asked Sep 12, 2018 by anonymous1 | 6 views
2 answers
asked Sep 6, 2018 by anonymous1 | 3 views
1 answer
5 answers
asked Aug 12, 2018 by Quiz | 383 views
1 answer
asked Sep 5, 2018 by anonymous1 | 15 views
1 answer