Valence & conduction band

kidia
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Can anybody explain to me why holes are found at the top of the valence band, whereas electrons are found at the bottom of the conduction band.
 
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Holes are found at the top of the valence band because the valence band electrons will rearrange themselves so that they occupy the lowest energy states, leaving only the highest energy level vacant. Electrons in the conduction band will similarly rearrange themselves so they occupy the lowest energy states.

Claude.
 
holes are like bubbles in sea of electrons
 

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