Why do charges accumulate at grain boundaries?

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

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