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Dynamics of photoinduced electron transfer from adsorbed molecules into solids

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Abstract

Ultrafast interfacial electron transfer from the donor orbital of organic chromophores into empty electronic acceptor states of a semiconductor and of a metal was investigated by two-photon photoemission spectroscopy (2PPE). Experimental tools and procedures have been developed for carrying out wet-chemistry preparation of the molecule/solid interface. The organic chromophore perylene was investigated with several different bridge/anchor groups on TiO2(110). One perylene compound was investigated for comparison on Ag(110). Angle and polarization dependent 2PPE measurements revealed the orientation of the perylene chromophore on the surface as controlled by the adsorption geometry of the respective anchor group on TiO2. UPS measurements gave the position of the HOMO level of the chromophore with respect to the Fermi level of the solid. The donor level of each molecule was found high enough to fulfill the “wide band limit” of heterogeneous electron transfer dynamics. Time constants for heterogeneous electron transfer were extracted from 2PPE transients. A difference by a factor of four was found, 13 fs against 47 fs, when a conjugated bond was exchanged for a saturated bond in the otherwise identical bridge group. The two different contributions to the 2PPE transients arising firstly from the excited state of the chromophore and secondly from the injected electrons were separated by measuring the latter contribution separately in the case of instantaneous interfacial electron transfer realized with catechol as adsorbate. The time scales measured for the electron transfer step and for the subsequent electron escape process from the surface into the bulk of TiO2 showed both good agreement with recent theoretical predictions of other groups for these systems.

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Authors and Affiliations

  1. SE4 Dynamics of Interfacial Reactions, Hahn-Meitner-Institute Berlin, 14109, Berlin, Germany

    L. Gundlach, R. Ernstorfer & F. Willig

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  1. L. Gundlach
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  2. R. Ernstorfer
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  3. F. Willig
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Correspondence to L. Gundlach.

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PACS

42.65.Ky; 79.60.BM; 78.47.+p; 73.20.-r; 79.60.Jv; 79.60.-i

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Gundlach, L., Ernstorfer, R. & Willig, F. Dynamics of photoinduced electron transfer from adsorbed molecules into solids. Appl. Phys. A 88, 481–495 (2007). https://doi.org/10.1007/s00339-007-4054-1

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