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impurity level

An energy level outside the normal band of the material, caused by the presence of impurity atoms. Such levels are capable of making an insulator semiconducting. The impurity atom may be a donor or acceptor. If a donor, the impurity induces electronic conduction through the transfer of an electron to the conduction band. If an acceptor, the impurity can induce hole conduction through the acceptance of an electron from the valence band.
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