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 .|