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Title: Quantum confinement and interface structure of Si nanocrystals of sizes 3–5 nm embedded in a-SiO2
Authors: Lioudakis, Emmanouil 
Othonos, Andreas S. 
Hadjisavvas, George C. 
Nassiopoulou, Androula Galiouna 
Kelires, Pantelis C. 
Major Field of Science: Engineering and Technology
Keywords: Monte Carlo simulations;Silicon nanocrystals;Spectroscopic ellipsometry;Optical properties
Issue Date: Apr-2007
Source: Physica E: Low-Dimensional Systems and Nanostructures, vol. 38, no. 1-2, pp. 128-134.
Volume: 38
Issue: 1-2
Start page: 128
End page: 134
Journal: Physica E: Low-Dimensional Systems and Nanostructures 
Abstract: Spectroscopic ellipsometry and Monte Carlo simulations are employed to answer the fundamental question whether the energy gaps of Si nanocrystals with sizes in the range of 3–5 nm, which are embedded in amorphous silica, follow or deviate from the quantum confinement model, and to examine their interfacial structure. It is shown that the optical properties of these nanocrystals are well described by the Forouhi–Bloomer interband model. Analysis of the optical measurements over a photon-energy range of 1.5–5 eV shows that the gap of embedded nanocrystals with a mean size of 3.9 nm follows closely quantum confinement theory. A large band gap expansion (0.65 eV) compared to bulk Si is observed. The Monte Carlo simulations reveal a non-abrupt interface and a large fraction of interface oxygen bonds. This, in conjunction with the experimental observations, indicates that oxygen states and the chemical disorder at the interface have a negligible influence on the optical properties of the material in this size regime.
ISSN: 1386-9477
DOI: 10.1016/j.physe.2006.12.020
Collaboration : University of Cyprus
University of Crete
IMEL/NCSR Demokritos
Rights: © Elsevier
Type: Article
Appears in Collections:Άρθρα/Articles

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