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(physics) An undoped semiconductor. This means that holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped semiconductors where holes or electrons are supplied by a “foreign” atom acting as an impurity.

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intrinsic semiconductor

In an intrinsic semiconductor, thermal excitation creates electron–hole pairs without any impurity atoms providing carriers.

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In an intrinsic semiconductor, thermal excitation creates electron–hole pairs without any impurity atoms providing carriers.

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