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What do you mean by zener breakdown and avalanche breakdown?
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Answer Posted / debi prasan das
zener breakdown occurs due tos strong electric field across
the diode.when a lower voltage is given ,higher electric
field is generated .due to strong electric field ,the
covalent bonds breakdown and free electrons are generated
when they are sufficient there is sharp rise in current and
breakdown occurs.
avalanche breakdown occurs due to higher velocity of
minority carriers.due to less doping the width of depeletion
region is more.so when a high voltage is given,velocity of
minority carriers increases towards opposite type
semiconductor.when they collide with the walls of
semiconductor,free electrons are generated.when free
electrons are sufficient ,then there is sharp rise in
currents and breakdown occurs.
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