What is the difference between avalanche breakdown and zener breakdown?

The difference between avalanche breakdown and zener breakdown are given below:

Avalanche breakdown Zener breakdown
It occurs in junctions which are lightly and have wide depletion widths.. It occurs in junctions which are heavily doped and have narrow depletion widths.
It occurs at higher reverse voltages when thermally generated electrons get enough kinetic energy to produce more electrons by collision. It occurs due to rupture of covalent bonds by strong electric fields set up in depletion region by the reveres voltage.
At reverse voltages above 6 V, breakdown is due to avalanche effect. At reveres voltage below 6 V, breakdown is due to zener effect.
Charge carriers obtain energy from the applied potential. Zener current is independent of applied voltage.
Electron hole pairs are generated. Large number of holes and electrons are produced
Electric field produced is weak in nature. A strong electric field is produced.

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