| Autor: |
Faraci, Giuseppe, Mannino, Giovanni, Pennisi, Agata R., Ruggeri, Rosa, Sberna, Paolo, Privitera, Vittorio |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Feb2013, Vol. 113 Issue 6, p063518, 5p, 4 Graphs |
| Abstrakt: |
We investigated the quantum confinement in Si nanocrystals embedded in a SiO2 matrix. The size was accurately controlled in the range 3-8 nm by annealing at high temperature Si/SiO2 multilayers fabricated by chemical vapour deposition. Raman shift and line width were compared with existing theoretical models for each cluster size. We found evidence of uni-dimensional confinement in 3 nm crystals, whereas for 4.5 nm crystals the confinement appears three-dimensional. This conclusion is supported by the luminescence spectra shifting towards higher wavelengths for the smaller size, in opposite direction for larger sizes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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