Experiments in magnetic fields suggest that defects are responsible for light emission from silicon nanocrystals. However, when these defects are passivated with hydrogen, quantum effects become responsible for the emission.
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Gösele, U. Shedding new light on silicon. Nature Nanotech 3, 134–135 (2008). https://doi.org/10.1038/nnano.2008.40
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DOI: https://doi.org/10.1038/nnano.2008.40
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