Depletion Region Effect
Mediumphysics
Depletion region width increases primarily under?
Select the correct option:
Solution
Incorrect! Answer:
Reverse bias
- Reverse Bias Connection: Positive terminal to N-region, Negative terminal to P-region.
- Carrier Motion: The external field pulls electrons in the N-side further away from the junction (toward the positive terminal) and holes in the P-side further away (toward the negative terminal).
- Space Charge Growth: This leaves behind more uncovered immobile ions (positive on N-side, negative on P-side).
- Width Change: The immobile ionized region, i.e., the depletion region, becomes wider.
- Impact: A wider depletion layer creates a stronger barrier, preventing charge carrier flow (except for a tiny leakage current).
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About This Question
- Subject
- physics
- Chapter
- semiconductor devices
- Topic
- depletion region effect
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Reverse bias
- Reverse Bias Connection: Positive terminal to N-region, Negative terminal to P-region.
- Carrier Motion: The external field pulls electrons in the N-side further away from the junction (toward the positive terminal) and holes in the P-side further away (toward the negative terminal).
- Space Charge Growth: This leaves behind more uncovered immobile ions (positive on N-side, negative on P-side).
- Width Change: The immobile ionized region, i.e., the depletion region, becomes wider.
- Impact: A wider depletion layer creates a stronger barrier, preventing charge carrier flow (except for a tiny leakage current).
This medium difficulty physics question is from the chapter semiconductor devices, covering the topic of depletion region effect. It appeared in the 2025 exam.
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