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← ScienceWhich consequence results when excessive arsenic doping modifies silicon crystal lattice band structure?
A)Increased free carrier concentration✓
B)Increased electron-phonon scattering
C)Enhanced piezoelectric coefficient
D)Elevated superconducting transition temperature
💡 Explanation
Increased arsenic doping introduces shallow donor levels near the conduction band, so the band gap decreases due to increased dopant impurities. This shifts the *Fermi level*, therefore increased free carrier concentration occurs rather than other electronic effects under normal temperature ranges.
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