Answer Posted / geethu

When doping is heavy then in reverse bias even before the
minority charge carriers aquire sufficient velocity the
breakdown occurs. This kind of breakdown is called Zener
breakdown.


When the reverse voltage is increased the width of the
depletion layer increases at the same time due to the force
of attraction and aquire high velocity. During their motion
inside the diodethey collide with the electrons which are
in covalent bonds of the crystaland bring them out of the
bond. Now these two charges again gain sufficient velocity
an da gain collide with the electrons in the covalent bonds
and bring them out. Due to this multiplication process a
large current flows and this kind of breakdown is called
Avalanche multiplication or Avalanche breakdown.

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