Diodes are two terminal electric components with infinite conductivity in one direction and infinite resistance in other direction .is a type of electrical breakdown in a reverse biased p-n diode in which the electric field enables tunneling of electrons from the valence to the conduction band of a semiconductor .

Zener Breakdown	Avalanche Breakdown
In the Zener effect or Zener breakdown , the electric field enables tunneling of electrons from the valence to the conduction band of a semiconductor in a reverse biased p-n diode . Both sides of PN junction are heavily doped in zener breakdown	The avalanche breakdown occurs when carriers in the transition region are accelerated by the electric field to energies sufficient to create mobile or free electron-hole pairs via collisions with bound electrons. Both sides of PN junction are lightly doped in avalanche breakdown .
Zener current is independent of applied voltage .	Charge carriers acquire energy from the applied potential .
A strong electric field is produced .	Electric field produced is weak in nature .
Large number of holes and electrons are produced .	Electron hole pairs are generated .

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Abhishek

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