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← ScienceWhich mechanism causes increased conductivity when doping germanium?
A)Increased carrier concentration within energy band✓
B)Reduced phonon scattering increases carrier mobility
C)Formation of Cooper pairs eases flow
D)Increased lattice symmetry at dopant sites
💡 Explanation
Introducing impurities adds electrons to the conduction band. Increased carrier concentration occurs, because the doping expands the electron population within the germanium's energy band, therefore enhancing electrical conductivity, rather than phonon interactions or lattice symmetry changes.
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