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