photodiode

Question

Photodiode operated under reverse bias generates current proportional to:

RankGuru · Accepted Answer

A photodiode is a p-n junction diode designed to detect light.
- It is operated in **reverse bias**.
- When light with energy $h
u > E_g$ falls on the depletion region, it creates electron-hole pairs.
- The electric field sweeps these carriers across the junction, creating a current called photocurrent.
- More incident photons (higher intensity) create more carriers per second, making the current **directly proportional to the light intensity**. This allows it to act as an accurate light sensor.

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