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Hole injection from P1 dye hot-excited states in p-type dye-sensitized films: a fluorescence study

Valentin Maffeis 1, 2 Bruno Jousselme 2 Thomas Gustavsson 1
2 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : We present a study of the excited state relaxation dynamics of the photosensitizer P1 used in p-type dye-sensitized solar cells. Comparative femtosecond fluorescence upconversion measurements in solution and in films show that the dye undergoes a picosecond electronic relaxation from the bright Franck–Condon (FC) state to a low-emitting charge-transfer (CT) state in polar environment. The fluorescence is moderately quenched in solution and on the mesoporous Al2O3 isolator but dramatically more on NiO semiconductor. We assign this sub-picosecond process to the hole injection thus confirming that the electron transfer is from the FC state directly into the NiO valence band.
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https://hal-cea.archives-ouvertes.fr/cea-03354989
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Submitted on : Monday, September 27, 2021 - 8:57:02 AM
Last modification on : Monday, October 11, 2021 - 3:16:59 AM

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Valentin Maffeis, Bruno Jousselme, Thomas Gustavsson. Hole injection from P1 dye hot-excited states in p-type dye-sensitized films: a fluorescence study. Photochemical & Photobiological Sciences , Royal Society of Chemistry, In press, 20, pp.1257-1271. ⟨10.1007/s43630-021-00098-8⟩. ⟨cea-03354989⟩

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