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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.
American Institute of Physics
Publication date: 
14 Feb 2013

Giuseppe Faraci, Giovanni Mannino, Agata R Pennisi, Rosa Ruggeri, Paolo Sberna, Vittorio Privitera

Biblio References: 
Volume: 113 Issue: 6 Pages: 063518
Journal of Applied Physics