MHT CET202615 April 2026Morning ShiftPhysicsSemiconductorsActual
Photodiode is a device
Options
- Ain which photocurrent is dependent on reverse bias.
- Bin which photocurrent is independent of incident radiation.
- Cwhich is always operated in forward bias.
- Dwhich is always operated in reverse bias.
Correct answer
D. which is always operated in reverse bias.
Step-by-step solution
A photodiode is a p-n junction fabricated from a photosensitive semiconductor and provided with a transparent window to allow light to fall on its junction. It is always operated under reverse bias. When the photodiode is illuminated with light (photons) with energy h greater than the energy gap E_g of the semiconductor, electron-hole pairs are generated due to the absorption of photons. Operating it in reverse bias makes it easier to observe changes in current with light intensity, because the fractional change in