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Which outcome impairs electron flow when semiconductor doping is excessive?

A)Increased electron-phonon scattering
B)Fermi level pinning at interface
C)Reduced dielectric breakdown strength
D)Impurity band formation overrides gap

💡 Explanation

Increased doping leads to impurity band formation, bridging the band gap by energy level overlap; therefore, electrons transition through the impurity band, rather than the intended conduction band because band gap collapses.

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