how pn-juntion works?

Discussion in 'General Electronics Chat' started by sabbi, Feb 25, 2010.

  1. sabbi

    Thread Starter New Member

    Feb 2, 2010
    8
    0
    in pn-juntion from which free electrons gets ionization energy to become free and how p side of pn-juntion attract these elctrons(from which force)
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    The free electrons come from the impurities (dopants) that are added to the silicon lattice. The holes, or the absence of free electrons, also come from the dopants that are added to the silicon lattice. The application of a forward bias reduces the potential barrier, allowing the electrons to easily move across the p-n junction in one direction while the holes move across the junction in the opposite direction.

    http://en.wikipedia.org/wiki/Pn_junction
     
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