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Which mechanism causes metallic behavior when doping intrinsic semiconductors?

A)Electron degeneracy filling the band
B)Phonon scattering inhibiting free carriers
C)Exciton formation creating bound states
D)Grain boundary scattering increasing resistivity

💡 Explanation

Doping shifts the Fermi level into the conduction or valence band, therefore increased carrier concentration leads to metallic conduction via Electron degeneracy filling the band, because electrons become delocalized rather than forming localized states.

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