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there are no electrons in the conduction band... the valence electrons are able to flow through the metal by moving into the hole in the next atoms valence band the conduction band would be used in the p-type where there is one extra electron, which is in the cnduction band and shifts along

boron is a group 3 element, and therefore the semi-conductor will be using the theory of "holes"... and the holes use valence electrons moving into the holes its b as the current is flowing to the right so the electrons are flowing to the left