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Which risk severely increases when the Fermi level enters a band?

A)Increased electron-hole recombination processes
B)Enhanced second harmonic generation (SHG)
C)Material transmutation into another element
D)Reduced thermal conductivity decreases efficiency

💡 Explanation

Increased electron-hole recombination causes shorter carrier lifetimes because the direct band gap allows electron transitions; therefore, electron-hole pairs annihilate, rather than electrons remaining in higher energy states due to quantum confinement.

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