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← ScienceWhich consequence occurs when an impurity disrupts silicon's conduction band edge?
A)Increased free carrier concentration.✓
B)Decreased phonon scattering rate.
C)Enhanced radiative recombination pathway.
D)Reduced dielectric breakdown strength.
💡 Explanation
The dopant introduces energy levels near the conduction band creating free electrons through increased thermal excitation across the reduced bandgap region. This is termed Impurity Band Conduction because electrons hop between dopant sites; therefore free carriers rise, rather than scattering decreasing or direct radiative paths.
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