Q. 123.9( 7 Votes )

Write the two processes that take place in the formation of a p-n junction. Explain with the help of a diagram, the formation of depletion region and barrier potential in a p-n junction.

Answer :

In P type semiconductor concentration of holes is more than


electrons and in N type semiconductor electrons concentration is


more than holes. When P-N junction type of semiconductor is


combined, holes from P side move towards N side and electrons from


n side move towards P side. In between, they collide and neutralize


to from P-N junction.


Thus, near the junction positive charge is built near N side and


negative charge is produced near P side.



This set up a potential difference across junction and from electric


field, E directed from N to P side. This generated electric field is strong


enough to stop further diffusion of majority charge carriers (but, it


helps minority charge carriers to drift across the junction). Either


sides of the junction becomes less dense of charge carriers and


becomes depleted called deletion region. From this point of time,


charge carriers need to overcome this potential barrier developed at


depletion layer.


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