Tight-binding calculations of SiGe alloy nanocrystals in SiO2 matrix

Microscopic investigation of phonon modes in SiGe alloy nanocrystals

Tight-Binding based SiGe Band Structure Calculations and Implication on Transport

This work presents a comprehensive analysis of the SiGe band structure using a TightBinding based approach within the virtual crystal approximation. We analyze the material properties of bulk relaxed SiGe and biaxially compressed strained systems. The simulation approach has been benchmarked against experimental data wherever possible. We further investigate the effect of process induced uniaxi...

XPS Studies of Silicon Nanoclusters/Nanocrystals Embedded in SiO2 Matrix

In this study, the analysis of the XPS Si 2p peaks shows the existence of the five chemical structures corresponding to the Si oxidation states Si n+ (n =0, 1, 2, 3, and 4) in Si-implanted SiO2 films, and the concentration of each oxidation states is determined quantitatively. The evolution of the five Si oxidation states as a function of thermal annealing is studied. On the other hand, Si 2p c...

Optical Properties of Silicon Nanocrystals Embedded in SiO2 Matrix

From the view point of both science and technology, it would be interesting and useful to examine the optical properties of isolated silicon nanocrystals (nc-Si) embedded in SiO2 matrix. A good understanding to optical properties of the nc-Si is definitely important to both the quantum physics and the applications especially in optoelectronic and photonic devices. In this work, spectroscopic el...

Influence of the crystallization process on the luminescence of multilayers of SiGe nanocrystals embedded in SiO2

Multilayers of SiGe nanocrystals embedded in an oxide matrix have been fabricated by low-pressure chemical vapor deposition of SiGe and Si02 onto Si wafers (in a single run at 390 °C and 50mTorr, using GeH4, Si2H6 and 02) followed by a rapid thermal annealing treatment to crystallize the SiGe nanoparticles. The main emission band is located at 400 nm in both cathodoluminescence and photolumines...