MCQ
The current flow in a Zener diode is mainly due to
- AThermally generated charge carriers
- BMinority charge carriers
- ✓Collision generated charge carriers
- DIons
✓
Answer
Correct option: C.
Collision generated charge carriers
When the reverse bias breakdown voltage is exceeded, a conventional diode is subject to high current due to avalanche breakdown.
Avalanche breakdown occurs in reverse bias when the applied voltage is high enough, the free electron may move fast enough to knock other electrons free, creating more free$-$electron$-$hole pairs $($i.e., more charge carriers$)$, increasing the current.
Thus, the current flow in a Zener diode is mainly due to collision generated charge carriers.
Avalanche breakdown occurs in reverse bias when the applied voltage is high enough, the free electron may move fast enough to knock other electrons free, creating more free$-$electron$-$hole pairs $($i.e., more charge carriers$)$, increasing the current.
Thus, the current flow in a Zener diode is mainly due to collision generated charge carriers.
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