Diffusion there are more holes on the p side so holes

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Diffusion: There are more holes on the P side, so holes tend to move ( diffuse ) across the junction toward the N side. There are more electrons on the N side, so electrons tend to diffuse across the junction toward the P side. Diffusion reduces the charge-carrier (electron and hole) concentrations near the junction. Electric field: The negatively ionized acceptors on the P-side and the positively ionized donors on the N-side can’t move. As the mobile charge carriers diffuse across the junction, they’re no longer there to balance these charges near the junction, creating a depletion region or space-charge region due the ionized impurities. These separated charges create an electric field and a potential barrier that opposes the tendency to diffuse. Drift currents due to E-field balance diffusion currents ; equilibrium is established; zero net current flow With the electric field comes the built-in potential of the junction: !
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  • Fall '10
  • Dr.RobertFox
  • Atom, Electron, Electric charge, pn junction, Bipolar Analog IC, PN Junction Theory

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