Photodiode is reverse biased but yet …
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Posted by Richa Mittal 3 years, 11 months ago
- 2 answers
Yogita Ingle 3 years, 11 months ago
When a photo-diode is reverse biased, the width of depletion layer increases as compared to forward biased and a small reverse current (dark current) flows through the diode . Now , when the light is incident on the junction, electron-hole pairs are generated in depletion layer in a big amount (due to broad depletion layer) and these charge carriers can easily cross the barrier, hence contribute to current across the diod.
We can say that in reverse bias, diode changes the incident light to current , more effectively due to broad depletion layer i.e. when the diode is reversed biased , no ordinary current flows and the detection of the photo current is much easier.
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Richa Mittal 3 years, 11 months ago
0Thank You