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Synthèse, caractérisation et nanostructuration de dérivés du polythiophène pour des applications en cellules photovoltaïques organiques

Abstract : This work is devoted to the synthesis of polythiophene derivatives with low bandgap and preserving high oxidation potential. Disubstituted thiophenes and “Donor-Acceptor” bithiophenes were synthesized and then polymerized. The side chains of these polymers, donor or acceptor, were modified in order to tune the properties of material as well from the optical point of view as electrochemical. These polymers were also tested in blend with PCBM in bulk-heterojunction photovoltaic cells. Voc delivered by the devices showed a linear dependence according to the potential of oxidation of the polymers. Copolymers containing cyanothiophene and alkyl- or alkoxythiophene showed values of 0.8 V. However,
in spite of power conversion efficiency of 1 %, these performances remain lower than the one obtained with the P3HT. Optimizations in terms of morphology are certainly necessary. Indeed, the morphology of the active layer plays a key role
in obtaining high power conversion efficiency. An original technique of nanostructuration of the polymer on a nanometric scale was developed during this work, leading to the development of fibrillar P3HT. These nanostructures, presenting an important degree of order, are formed spontaneously in solution. Their rate compared to amorphous material is perfectly controllable and adjustable in solution and in solid state. Measurements of mobilities show a strong improvement of the transport of load within these fibrillar layers compared to a traditional film of P3HT obtained without annealing. Power conversion efficiencies of 3.6 % on glass and 3.3 % on plastic were reached without annealing.
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Submitted on : Sunday, November 18, 2007 - 11:50:37 AM
Last modification on : Wednesday, November 4, 2020 - 2:28:55 PM
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Solenn Berson. Synthèse, caractérisation et nanostructuration de dérivés du polythiophène pour des applications en cellules photovoltaïques organiques. Matériaux. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00188553⟩

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