Photodiode Mode
Mediumphysics
Photodiode typically operated in?
Select the correct option:
Solution
Incorrect! Answer:
Reverse bias
- Definition: A photodiode is a PN junction device used to detect light signals.
- Operational Mode: It is intentionally operated under reverse bias conditions.
- Reasoning: In reverse bias, the dark current (current without light) is very small. When light strikes the depletion region, it creates new electron-hole pairs.
- Sensitivity: These photo-generated carriers increase the reverse current significantly. The fractional change in reverse current due to light is much larger and easier to measure than the fractional change in forward current would be.
- Proportionality: The reverse photocurrent is directly proportional to the incident light intensity.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
About This Question
- Subject
- physics
- Chapter
- semiconductor devices
- Topic
- photodiode mode
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Reverse bias
- Definition: A photodiode is a PN junction device used to detect light signals.
- Operational Mode: It is intentionally operated under reverse bias conditions.
- Reasoning: In reverse bias, the dark current (current without light) is very small. When light strikes the depletion region, it creates new electron-hole pairs.
- Sensitivity: These photo-generated carriers increase the reverse current significantly. The fractional change in reverse current due to light is much larger and easier to measure than the fractional change in forward current would be.
- Proportionality: The reverse photocurrent is directly proportional to the incident light intensity.
This medium difficulty physics question is from the chapter semiconductor devices, covering the topic of photodiode mode. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse semiconductor devices questions on RankGuru.