ex·ci·ton (ěk'sĭ-tŏn', -sī-) n. An electrically neutral excited state of an insulator or semiconductor, often regarded as a bound state of an electron and a hole.
the combination of an electron and a positive hole (an empty electron state in a valence band), which is free to move through a nonmetallic crystal as a unit
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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