So I'm confused about electrons holes and how they differ from free electrons. I have this question in my mind for months and I couldn't any solid answer.
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In a solid (semiconductor), an electron hole is the absence of an electron where one is expected. In this sense you can think of an electron hole as if it were an air bubble (the absence of water) in a body of water- a local spot where there should be water but there isn't.
In the case of water in the presence of gravity, water falls down- but bubbles in the water fall up instead. For an electron hole, an electric field that would accelerate an electron in one direction will accelerate a hole in the opposite direction- leading one to conclude that in an electron sea, a hole where there is no electron behaves as if it had a positive charge.
niels nielsen
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