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CBSE Class 12-science Answered

Why photo diode act in reverse biase only?
Asked by Tanya | 14 Jan, 2015, 11:53: AM
answered-by-expert Expert Answer
A photo diode is a device which produces current when light is incident on it.
 
It is designed for the purpose that it conducts only when light falls on it. Hence, it is connected in reverse bias.
 
If it is connected in forward bias then it will conduct normally and it will defeat the purpose.
 
When light falls on the depletion region of the p-n junction photodiode, electron hole pairs are formed near the depletion region and the diode conducts.
Answered by Romal Bhansali | 14 Jan, 2015, 12:07: PM
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