Effects of the amorphous-crystalline transition on the luminescence of quantum confined silicon nanoclustersM. Molinari, H. Rinnert and M. Vergnat
Laboratoire de Physique des Matériaux (UMR CNRS No. 7556) Université Henri Poincaré Nancy 1 - B.P. 239 54506 Vandoeuvre-lès-Nancy Cedex, France
(Received 2 July 2003; accepted in final form 6 April 2004)
Quantum confinement properties in silicon nanostructures are studied in silicon oxide and silicon nitride films at the amorphous/crystalline transition. The silicon cluster state is controlled with the annealing temperature. In both amorphous and crystalline structures, an intense luminescence is observed in the visible range at room temperature. It is shown that the luminescence intensity and the confinement energy are stronger in the crystalline state than in the amorphous state. These experimental results are consistent with previous electronic structure calculations of silicon nanoclusters.
61.46.+w - Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
68.65.Hb - Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties (quantum dots).
78.55.-m - Photoluminescence, properties and materials.
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