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← ScienceWhich consequence results when dopants disrupt silicon crystal periodicity?
A)Reduced average phonon mean free path✓
B)Increased intrinsic carrier concentration
C)Enhanced electron-phonon coupling strength
D)Decreased minority carrier lifetime only
💡 Explanation
Dopants introduce scattering centers, causing shorter paths for phonons, which limits thermal conductivity via phonon transport. Phonon scattering increases because of the missing periodicity, rather than decreased carrier lifetime; therefore, option A, rather than others.
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