Solved By : Tahir
Siddiqui(Mani)
When a diode is reverse
biased the positive terminal is connected to the n side of the junction and the
negative terminal is connected the p junction. This results in the drawing of
electrons towards the n junction and holes towards the p junction. Now there
are some minority carriers which are present in the diode which conduct
electricity in the range of micro amperes. Now if we increase the voltage the
bonds near the junction starts breaking off which produces large number number
of electron hole pairs which suddenly increases the current output.
Hence the diode behaves like an ordinary conductor.
This is called as breakdown. Now there are two ways to breakdown which are
zener breakdown and avalanche breakout.
Breakdown is
characterized by the rapid increase of the current under reverse bias. The
corresponding applied voltage is referred to as the breakdown voltage.The
breakdown of logic devices is equally important as one typically reduces the
device dimensions without reducing the applied voltages, thereby increasing the
internal electric field.
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