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Hey, I remembered something else that let me accept
"hole flow." A hole is not just a hole. Only if the
p-type semiconductor was made entirely of electron-stuff
would a hole be an empty spot, and in that case the hole
would not have a positive charge.
In truth, a hole acts to "expose" the positive charge of the
silicon's protons which normally would be cancelled out.
It's easy to concentrate on the emptiness of the "hole"
while forgetting that a hole is most definitely a positive
charge carrier.