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Article Dans Une Revue Journal of Nanoparticle Research Année : 2013

Optical properties of uniformly sized silicon nanocrystals within a single silicon oxide layer

Résumé

Silicon nanocrystals (Si-NC) with different sizes (2-6 nm) are synthesized by evaporation. The system is composed of a single Si-NC layer that is well controlled in size. The numerical modeling of such system, without a large size distribution, is suitable to perform easily the optical calculations. The nanocrystal size and confinement effects on the optical properties are determined by photoluminescence (PL) measurements, absorption in the UV visible range, and spectroscopic ellipsometry (SE). The optical constants and the bandgap energies are then extracted and analyzed. The dependence of the optical responses with the decrease of the size of the Si-NC occurs not only with a drastic reduction of the amplitudes of dielectric function but also by a significant expansion of the optical gap. This study supports the idea of a presence of a critical size of Si-NC for which the confinement effect becomes weak. The evolution of those bandgap energies are discussed in comparison with values reported in literature.

Dates et versions

hal-01285171 , version 1 (08-03-2016)

Identifiants

Citer

A. En Naciri, Patrice Miska, A. -S. Keita, Y. Battie, Hervé Rinnert, et al.. Optical properties of uniformly sized silicon nanocrystals within a single silicon oxide layer. Journal of Nanoparticle Research, 2013, 15 (4), ⟨10.1007/s11051-013-1538-0⟩. ⟨hal-01285171⟩
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