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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits2 Marks
Question
State with reason why a photodiode is usually operated at a reverse bias.
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Answer

The fractional change due to incident light on minority charge carriers in reverse bias is much more than that over the majority charge carriers in forward bias. This charge in reverse bias current is more easily measurable. So, photodiodes are used to measure the intensity in reverse bias condition.

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