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Why do charges accumulate at grain boundaries?

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citw
#1
Oct15-13, 05:34 PM
P: 72
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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UltrafastPED
#2
Oct15-13, 09:14 PM
Sci Advisor
Thanks
PF Gold
UltrafastPED's Avatar
P: 1,908
The internal potential for the neighboring grains differ due to strain and imperfections. This generates an effective field between the grains.
DrDu
#3
Oct16-13, 01:38 AM
Sci Advisor
P: 3,564
I think the example best understood is that of a pn junction in semiconductors.


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