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← ScienceWhich 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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