Ultrafast photoinduced processes in alizarin-sensitized metal oxide mesoporous films

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Lars DworakJ Wachtveitl

Abstract

Close to the edge: Photoexcitation of alizarin coupled to the surface of mesoporous TiO(2) films leads to ultrafast electron transfer to the TiO(2) conduction band (see picture). Complex kinetics after photoexcitation depend on the excitation energy, and indicate a position of the alizarin excited state close to the TiO(2) conduction band edge, where the density of acceptor states is reduced. The photoinduced dynamics in Al(2)O(3) and TiO(2) mesoporous films sensitized by the strongly coupled alizarin dye is investigated by femtosecond transient absorption spectroscopy in the spectral range from UV to mid-IR. Alizarin/Al(2)O(3) acts as a nonreactive reference system, in which no electron transfer is observed. For comparison, the photoexcitation of the alizarin dye coupled to the surface of TiO(2) films leads to ultrafast electron transfer from the dye to the TiO(2) conduction band on the sub-100-fs timescale. We observe a fast relaxation of the alizarin excited state as well as a fast recombination of injected electrons with the alizarin cation on the picosecond timescale, which gives rise to very complex kinetics at short delay times. The infrared measurements clearly indicate that trapping of injected electrons is the main me...Continue Reading

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Citations

Dec 20, 2012·The Journal of Chemical Physics·Jingrui LiMichael Thoss
Jun 5, 2014·Physical Chemistry Chemical Physics : PCCP·P TrojanowskiJ Wachtveitl
May 21, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Victor V MatylitskyJosef Wachtveitl
Mar 24, 2015·Scientific Reports·Felix SchweighöferJosef Wachtveitl
Mar 15, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jingrui LiMichael Thoss
Sep 12, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lars DworakJosef Wachtveitl
Feb 20, 2020·Journal of the American Chemical Society·Junhui WangKaifeng Wu

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