Size-dependent oxygen-related electronic states in silicon nanocrystals

Biteen, J. S.; Lewis, N. S.; Atwater, H. A.; Polman, A.
June 2004
Applied Physics Letters;6/28/2004, Vol. 84 Issue 26, p5389
Academic Journal
Silicon nanocrystals embedded in SiO2 were isolated with a selective etching procedure, and the isolated nanocrystals' excitonic emission energy was studied during controlled oxidation. Nanocrystals having initial diameters, d0, of ∼2.9–3.4 nm showed a photoluminescence (PL) blueshift upon oxidatively induced size reduction, as expected from models of quantum confinement. Oxidation of smaller Si nanocrystals (d0 ∼2.5–2.8 nm) also initially resulted in a PL blueshift, but a redshift in the PL was then observed after growth of ∼0.3 monolayers of native oxide. This decrease in excitonic emission energy during oxidation is consistent with the theoretically predicted formation of an oxygen-related excitonic recombination state.


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