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Which outcome occurs when incident photons lack sufficient energy to overcome the band gaps in silicon nanocrystals?

A)Material exhibits increased optical transparency
B)Enhanced electron-hole pair recombination arises
C)Increased free carrier concentration results
D)Augmented electrical conductivity becomes apparent

💡 Explanation

The material shows optical transparency because photons with less energy than the band gap cannot excite electrons to the conduction band, preventing absorption. Therefore, transparency increases rather than electron recombination; conductivity won't increase since fewer electrons jump the gap.

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