The p n junction diode is a two terminal device. A pn junction diode allows electric charges to flow in one direction but not in the opposite direction.
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A p n junction diode is formed by doping one side of a piece of silicon with a p type dopant boran and the other side with a n type dopant phosphorusge can be used instead of silicon.
Pn junction diode mechanism. N side or n side is more negative wrt. The avalanche breakdown occurs because of the ionisation of electrons and hole pairs whereas the zener diode occurs because of heavy doping. The behaviour of the pn junction with regards to the potential barriers width produces an asymmetrical conducting two terminal device better known as the pn junction diode.
The zener and avalanche breakdown both occur in diode under reverse bias. Watch this video to know more about the formation of p n junction diode its v i characteristics and p n junction diode breakdown mechanism. So how does it work.
Zener breakdown and avalanche breakdown the avalanche breakdown and zener breakdown are two different mechanisms by which a pn junction breaks. In this articlewe have explained pn junction breakdown characteristics of diode through avalanche breakdown and zener breakdown phenomena. If the reverse bias applied to a p n junction is increased a point will reach when the junction breaks down and reverse current rises sharply to a value limited only by the external resistance connected in series.
This understanding will lay a better foundation for exploring further into different aspects of semiconductor electronics. A pn junction diode is one of the simplest semiconductor devices around and which has the characteristic of passing current in only one direction only. Lets say there are two semiconductors p type an.
Break down mechanism in p n junction diode. P side holes are injected from the p side red across the depletion region around the junction a region depleted of mobile carriers into the n. When the pn junction is forward biased electric charge flows freely due to reduced resistance of the.
When we increase the reverse voltage across the pn junction diode what really happens is that the electric field across the diode junction increases both internal external. Negative charges electrons can easily flow through the junction from n to p but not from p to n and the reverse is true for holes. Under the forward bias p side is more positive wrt.
This is the basic construction of the p n junction diode. Diode works on the principle of current displacement and drift in a semiconductor material when doped with an internal voltage difference also called barrier potential. In this tutorial we will learn about pn junction diodes and in particular the characteristics and working of pn junction diode.
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