Photodiode
Photodiode operated under reverse bias generates current proportional to:
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About This Question
- Subject
- physics
- Chapter
- semiconductor electronics
- Topic
- photodiode
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Incident light intensity
A photodiode is a p-n junction diode designed to detect light.
- It is operated in reverse bias.
- When light with energy hν>Eg 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.
This medium difficulty physics question is from the chapter semiconductor electronics, covering the topic of photodiode. It appeared in the 2025 exam.
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