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- W2373725906 abstract "The photoluminescence(PL) of nanocrystal present in porous silicon shifts from the near infrared to the ultraviolet depending on the size when the surface is passivated with Si-H bonds.After oxidation,the center wavelength of PL band is pinned in the region of 700nm～750nm and its intensity increases obviously.Calculation shows that trap electronic states appear in the band gap of the smaller nanocrystal when Si=O bonds or Si—O—Si bonds are formed.The changes in PL intensity and wavelength can be explained by both quantum confinement and trap states in oxidation layer of nanocrystal.In the theoretical model,the most important factor in the enhancement and pinning effect of PL emission is the relative position between the level of the trap states and the level of the photoexcitation in the silicon nanocrystal.【" @default.
- W2373725906 created "2016-06-24" @default.
- W2373725906 creator A5069930364 @default.
- W2373725906 date "2009-01-01" @default.
- W2373725906 modified "2023-09-25" @default.
- W2373725906 title "Trap States in Oxidation Layer of Nanocrystal Si" @default.
- W2373725906 hasPublicationYear "2009" @default.
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