depletion region effect

Question

Depletion region width increases primarily under?

RankGuru · Accepted Answer

1. **Reverse Bias Connection**: Positive terminal to N-region, Negative terminal to P-region.
2. **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).
3. **Space Charge Growth**: This leaves behind more uncovered immobile ions (positive on N-side, negative on P-side).
4. **Width Change**: The immobile ionized region, i.e., the **depletion region**, becomes **wider**.
5. **Impact**: A wider depletion layer creates a stronger barrier, preventing charge carrier flow (except for a tiny leakage current).

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depletion region effect

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