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Couches minces et membranes auto supportées de silicium poreux : nanocomposites hybrides et apport de la diffusion Raman infrarouge

Abstract : The large developed area of porous silicon makes it a potential host for the incorporation of organic molecules. The hybrid nanocomposites based on luminescent conjugated molecules may be suitable for applications in optoelectronics.
The study includes two parts: the first is devoted to the morphological and optical properties study of porous silicon thin layers and free standing membranes fabricated in the laboratory, using electron microscopy, spectroscopic ellipsometry and absorption. The microstructural analysis of porous layers by Raman scattering allowed us to estimate the nanocrystallite size distribution via the phonon confinement model and confirms the absence of free charge carriers. A polarized Raman study of free porous membrane allows us to probe inhomogeneities of the light propagation in this material.
The second part presents the studies on the impregnation of fluorescent molecules in the pores. Photoluminescence gives a way to verify the effectiveness of the incorporation of Rhodamine R6G molecule and its homogeneity. The selective excitation allows to study the energy transfer between the two materials. The time-resolved photoluminescence shows that the presence of R6G creates new channels of non-radiative desexcitation.
The THD is incorporated into free membranes made organophiles, and then spontaneously polymerize in situ in poly-diacetylene. The angular variation of the photoluminescence and Raman scattering show the presence of polymer chains whose the degree of orientation is consistent with a growth along the pores.
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Submitted on : Thursday, June 18, 2009 - 11:40:44 AM
Last modification on : Wednesday, December 9, 2020 - 3:05:25 PM
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  • HAL Id : tel-00396479, version 1

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Dorra Abidi. Couches minces et membranes auto supportées de silicium poreux : nanocomposites hybrides et apport de la diffusion Raman infrarouge. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI; Université de Tunis El-Manar, 2009. Français. ⟨tel-00396479⟩

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