CBSE Class 12-science Answered
Q- we find a large current of order m milliampere in forward bias and a small current of order microampere in Reverse bias condition so why we connect photodiode in Reverse bias
Asked by modi72879 | 16 Dec, 2017, 10:43: AM
Expert Answer
- A photodiode converts incident light to electric current more efficiently in reverse bias condition than in forward bias.
- The absorbed photons generate electron-hole pairs in the depletion region.
- There is a strong electric field there to separate the two different charge carriers.
- In a reverse biased pn junction, the width of depletion region increases as you increase the applied reverse bias voltage across the diode.
- By applying a larger voltage, more of the incident photons are converted to electric current, and the efficiency of photodiode increases
Answered by Abhijeet Mishra | 17 Dec, 2017, 10:31: PM
Concept Videos
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Applications of p-n Diode - Part 1
This video explains the diode in a forward and a reverse bias. -
PN diode application
Diode V-I characteristics Diode as a rectifier Special purpose diodes. -
Applications of pn Diode
Diode V-I characteristics Diode as a rectifier Special purpose diodes
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