Abstract
A detailed photoluminescence (PL) analysis and transmission electron microscopy studies on silicon nanocrystals (SNCs) are presented to probe the carrier recombination mechanism. There exist obvious distinctive phenomena in different sizes of SNCs. Clear evidence for the breakdown point of quantum confinement PL is confirmed in small SNCs; it is regarded as inflection point for SNCs' corresponding electronic states. Moreover, the energy-transfer based carrier multiplication and SNCs nanotwin are also observed between neighboring nanocrystals in large ones. Finally, a systematic model has been proposed to explain the evolution of SNCs' PL mechanism along with the size and space-separation of SNCs.
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