- Describe the working of photodiode by drawing the circuit diagram.
- Draw the characteristics of a photodiode for different illumination intensities.
- Why is photodiode operated in reverse bias even though the reverse bias current is much weaker than the current in forward bias?
CBSE OUTSIDE DELHI - SET 1 EAST 2016
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- When light with energy $\text{hv} > \text{(?????? ???)} \text{?}_{?}$ falls on photodiode, electron-hole pairs are generated.
- Due to electric field at the junction, electrons and holes are separated before they combine.
- Electrons are collected on n-side and holes are collected on p-side giving rise to an emf and current flows in external load.
- It is easier to observe the change in the current, with change in the light intensity, when reverse bias is applied.
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