P-n Junction Formation
Depletion region forms due to:
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About This Question
- Subject
- physics
- Chapter
- semiconductor electronics
- Topic
- p-n junction formation
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Diffusion of carriers creating space charge
When p-type and n-type materials are joined:
- Electrons from the n-side diffuse across the junction to the p-side, and holes from the p-side diffuse to the n-side.
- Upon crossing, they recombine. This leaves behind uncovered ionized donor atoms (+) on the n-side and ionized acceptor atoms (−) on the p-side.
- This region of immobile ions is called the depletion region. It creates a built-in electric field that eventually stops further diffusion.
This medium difficulty physics question is from the chapter semiconductor electronics, covering the topic of p-n junction formation. It appeared in the 2025 exam.
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