Solar Cell
Solar cell differs from photodiode mainly because it:
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About This Question
- Subject
- physics
- Chapter
- semiconductor electronics
- Topic
- solar cell
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Generates emf without external bias
A solar cell (photovoltaic cell) is essentially a p-n junction that converts light energy directly into electrical energy.
- Use of no external battery: Unlike a photodiode, which needs a battery to function, a solar cell generates its own voltage (Electromotive Force, EMF).
- When light hits the junction, carriers are generated and separated by the built-in field. This creates a potential difference across the terminals, allowing it to drive current through an external load. It effectively acts as a power source.
This hard difficulty physics question is from the chapter semiconductor electronics, covering the topic of solar cell. It appeared in the 2025 exam.
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