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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
The current flow in a Zener diode is mainly due to
  • A
    Thermally generated charge carriers
  • B
    Minority charge carriers
  • C
    Collision generated charge carriers
  • D
    Ions
✓

Answer

  1. Collision generated charge carriers

Explanation:

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.

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