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← ScienceWithin semiconductor nanocrystals, which effect limits electron-hole recombination efficiency?
A)Surface trap state concentration✓
B)Phonon energy quantization
C)Quantum dot size uniformity
D)Exciton diffusion coefficient
💡 Explanation
Recombination efficiency is reduced because dangling bonds create surface trap states that capture carriers via the process of surface passivation; therefore, surface trap state concentration limits electron-hole recombination, rather than phonon modes or diffusion because the unpassivated nanocrystal surface dominates behavior.
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