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← ScienceWhich phenomenon limits electron conduction when dopants alter band structure?
A)Impurity scattering reduces electron mobility✓
B)Increased Fermi energy increases velocity
C)Phonon creation allows faster propagation
D)Enhanced tunneling allows overcoming barriers
💡 Explanation
Impurity scattering reduces electron mobility at high doping concentrations because the altered band structure creates many ionized impurities. Therefore, electron flow is impeded rather than enhanced; while Fermi energy shifts, this does not improve conduction in this case.
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