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← ScienceWhich mechanism causes increased conductivity when doping semiconductors with elements having extra valence electrons?
A)Band gap narrowing by impurity states✓
B)Increased electron effective mass
C)Reduced phonon scattering rate
D)Enhanced intrinsic carrier concentration
💡 Explanation
When doping semiconductors with elements having extra valence electrons, shallow donor states are created near the conduction band leading to band gap narrowing because the loosely bound electrons can be easily excited into the conduction band. Therefore increased conductivity results, rather than other effects which either reduce conductivity or require different doping conditions.
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