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ARCHITECTURES HYBRIDES AUTO-ASSEMBLEES A BASE DE SYSTEMES POLYCONJUGUES ET DE NANOCRISTAUX DE SEMI-CONDUCTEURS POUR LE PHOTOVOLTAÏQUE PLASTIQUE

Julia de Girolamo 1
1 LEMOH - Laboratoire d'Electronique Moléculaire Organique et Hybride
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/INAC/SYMMES
Abstract : This work is devoted to the elaboration of self-assembled hybrid materials based on poly(3-hexylthiophene) and CdSe nanocrystals for photovoltaic applications.
For that, complementary molecular recognition units were introduced as side chain groups on the polymer and at the nanocrystals' surface. Diaminopyrimidine groups were introduced by post-functionalization of a precursor copolymer, namely poly(3-hexylthiophène-co-3-bromohexylthio-phène) whereas thymine groups were introduced at the nanocrystals' surface by a ligand exchange reaction with 1-(6-mercaptohexyl)thymine.
However, due to their different solubility, the mixing of the two components by solution processes is difficult. A “one-pot” procedure was developed, but this method led to insoluble aggregates without control of the hybrid composition.
To overcome the solubility problem, the layer-by-layer method was used to prepare the films. This method allows a precise control of the deposition process. Experimental parameters were tested in order to evaluate their impact on the resulting film. The films morphology was investigated by microscopy and X-Ray diffraction techniques. These analyses reveal an interpenetrated structure of nanocrystals within the polymer matrix rather than a multilayered structure. Electrochemical and spectroelectrochemical studies were performed on the hybrid material deposited by the LBL process. Finally the materials were tested in a solar cell configuration and the I=f(V) curves reveals a clear photovoltaic behaviour.
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Submitted on : Thursday, September 18, 2008 - 2:54:19 PM
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  • HAL Id : tel-00322721, version 1

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Julia de Girolamo. ARCHITECTURES HYBRIDES AUTO-ASSEMBLEES A BASE DE SYSTEMES POLYCONJUGUES ET DE NANOCRISTAUX DE SEMI-CONDUCTEURS POUR LE PHOTOVOLTAÏQUE PLASTIQUE. Matériaux. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00322721⟩

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