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PHY301 GDB Solution 2016

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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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