The isolation of silicon nanocrystals embedded in SiO 2 and isolated nanocrystals' excitonic emission energy were investigated during controlled oxidation. The nanocrystals with diameters of ∼2.9-3.4 nm exhibited photoluminescence (PL) blueshift upon oxidatively induced size reduction. The oxidation of smaller Si nanocrystals resulted in a PL blueshift, but a redshift in the PL was observed after growth of ∼0.3 monolayers of native oxide. The results show that decrease in excitonic emission energy during oxidation is consistent with formation of an oxygen-related excitonic recombination state.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)