Structure of semiconductor purity. The valence electrons of each atom is bonded to the valence electrons of an atom side. There are no free electrons to cause electrical conductivity. However, when the ambient temperature is too high. Absolute zero (absolute zero) if the electric field intensity is enough to. To make some of the bonding electrons ejected electrons become independent. And vulnerabilities called Holstein by force due to the electric field causes electrons and holes move freely. The free electrons are moving in the opposite direction to the electric field. The whole is moving in the same direction with the electric field. Therefore, it is concluded that Conductivity in semiconductors Caused by the movement of free electrons and holes.
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