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Caractérisation et intégration de nouveaux systèmes donneur-accepteur dans des cellules photovoltaïques

Abstract : This thesis deals with thephotophysical study of donor-π-acceptorchromophores used in dye sensitized solar cells.After photo-excitation, these molecules undergointramolecular charge transfer (ICT), solvationand charge injection processes that take place inthe picosecond time domain. However, anyenergetic relaxation of the excited statedecreases the injection kinetics.Steady-state spectroscopy and time-resolvedfluorescence measurements (from the femto- tothe nanosecond) were used to solve therelaxation dynamics of these dyes in solution, onmesoporous films and in complete cells.The spectral relaxation and fluorescencequenching dynamics of the excited state couldbe characterized independently and highlight anelectronic relaxation at the excited state. Thethree dyes studied evolve towards a chargetransfer state (CT state). Such a state is in stronginteraction with its environment.To study charge injection in semiconductormesoporous oxides, a time-resolvedfluorescence set-up for the study of opaque anddiffusive systems has been implemented and isdescribed in this thesis. It provides a timeresolution of about 300 fs.The results demonstrate the existence of acompetition between the injection of chargesand the relaxation of the excited state in thecomplete cells
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Submitted on : Friday, November 30, 2018 - 12:45:07 PM
Last modification on : Thursday, July 1, 2021 - 4:44:53 PM
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  • HAL Id : tel-01940557, version 1

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Valentin Maffeis. Caractérisation et intégration de nouveaux systèmes donneur-accepteur dans des cellules photovoltaïques. Chimie théorique et/ou physique. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS376⟩. ⟨tel-01940557⟩

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