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Optimisation des cellules solaires à colorants à base de ZnO par une approche combinée théorie/expérience

Abstract : During the last decade, it has been proven that dye-sensitized solar cells have been an economically viable photovoltaic technology. Despite numbers of studies realized in that field, we have to admit that photoconversion efficiencies of such devices are still under 12% on that type of systems. In this context, all works performed along this thesis was thus focused on the optimization of the performances of dyes-sensitized solar cells. To reach this objective, an approach joining theory and experiments was developed. From calculations based on Density Functional Theory (DFT), a new family of dyes, characterized by the presence of a pyridinium fragment, was studied in order to define and identify molecules best adapted to generate a significant photocurrent. Combining, a molecular and a periodic approach, calculations allowed to understand the different mechanisms involved in the solar cell working principle permitting the optimization of some constituents of the cell such as the electrolyte composition and the dye molecules. An experimental protocol for the production and characterization of solar cells based on ZnO as semiconductor in a laboratory scale was also developed during this thesis. Analogously, the new dyes studied at theoretical level were also experimentally synthesized and characterized. Overall, the experimental conception and characterization of solar cells using new dyes allowed to validate the theoretical protocol and paves the route for an ab initio optimization of dye-sensitized solar cells.
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https://pastel.archives-ouvertes.fr/pastel-00661405
Contributor : Anne Joubert <>
Submitted on : Thursday, January 19, 2012 - 2:45:29 PM
Last modification on : Tuesday, September 22, 2020 - 3:39:09 AM
Long-term archiving on: : Friday, April 20, 2012 - 2:30:43 AM

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  • HAL Id : pastel-00661405, version 1

Citation

T. Le Bahers. Optimisation des cellules solaires à colorants à base de ZnO par une approche combinée théorie/expérience. Chimie analytique. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨pastel-00661405⟩

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