Why do charges accumulate at grain boundaries?

  1. The concept of "space charge" around grain boundaries keeps coming up in my reading. I understand that charges tend to build up at grain boundaries, but I'm not sure why. Can someone explain what "draws" charges to boundaries?
     
  2. jcsd
  3. UltrafastPED

    UltrafastPED 1,919
    Science Advisor
    Gold Member

    The internal potential for the neighboring grains differ due to strain and imperfections. This generates an effective field between the grains.
     
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  4. DrDu

    DrDu 4,191
    Science Advisor

    I think the example best understood is that of a pn junction in semiconductors.
     
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