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In page Cathode:

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In a semiconductor diode, the cathode is the N–doped layer of the p–n junction with a high density of free electrons due to doping, and an equal density of fixed positive charges, which are the dopants that have been thermally ionized. In the anode, the converse applies: It features a high density of free "holes" and consequently fixed negative dopants which have captured an electron (hence the origin of the holes).[citation needed]