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Which outcome reduces the efficiency when germanium crystals operate above 100°C?

A)Increased electron-hole recombination rate
B)Enhanced crystal lattice superconductivity
C)Reduced phonon scattering amplitude
D)Increased spontaneous ferromagnetic alignment

💡 Explanation

Increased temperature increases the probability of electrons moving to the conduction band, and electron-hole recombination occurs more frequently because thermal energy overcomes the bandgap. Therefore, efficiency declines, rather than enhancements, because more electrons are available for undesired recombination events.

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