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PN junction diode barrier potential attracted to free electrons or holes?

  1. Jun 10, 2012 #1
    I am wondering about the barrier in PN junction diode.Due to diffusion negative ions are formed on the P side and Positive ions are formed on the N side of the diode.both opposite sides exert force of attraction and so a line of positive ions and negative ions align along the junction.
    The question is as free electrons remaining in the N region and also the holes in the P region left behind in the P region.Why these carriers are not attracted so electrons from the N side neutralize the positive ions in the N region and so as the holes in the P region.

    Why the force is existing between the ions and not between the free electrons and the positive ions.

    Second my question is why there is a barrier potential? When opposites and equal charges present in the depletion layer should cancel their electrostatic or electric field effect?
  2. jcsd
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