Hole injection from P1 dye hot-excited states in p-type dye-sensitized films: a fluorescence study - Archive ouverte HAL Access content directly
Journal Articles Photochemical & Photobiological Sciences Year : 2021

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

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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.

Dates and versions

cea-03354989 , version 1 (27-09-2021)

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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 , In press, 20, pp.1257-1271. ⟨10.1007/s43630-021-00098-8⟩. ⟨cea-03354989⟩
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