Question

difference between zener breakdown and avalanche breakdown

Answer 1

Zener breakdown :

1. The doping in the formation of P-N junction is high.

2. In this the covalent bonds breaks spontaneously.

3. Low reverse potential is required for breakdown.

4. In this the covalent bonds near the junction break due to high reverse potential ~20 V and consequently electrons become free.

Avalanche breakdown :

1. The doping in the formation of P-N junction is low.

2. The covalent bonds break as a result of collision of electrons and holes with the valence electrons.

3. Higher reverse potential is required for breakdown.

4. In this the thermally generated electrons due to electric field ionize other atoms and release electrons.

Answer 2

Explanation:

The main difference between Zener breakdown and avalanche breakdown is their mechanism of occurrence. Zener breakdown occurs because of the high electric field whereas, the avalanche breakdown occurs because of the collision of free electrons with atoms. Both these breakdowns can occur simultaneously.