Beyond vibrationally mediated electron transfer: interfacial charge injection on a sub-10-fs time scale

Robert Huber; Jacques E. Moser; Michael Gratzel; Josef L. Wachtveitl

doi:10.1117/12.506722

4 December 2003 Beyond vibrationally mediated electron transfer: interfacial charge injection on a sub-10-fs time scale

Robert Huber, Jacques E. Moser, Michael Gratzel, Josef L. Wachtveitl

Proceedings Volume 5223, Physical Chemistry of Interfaces and Nanomaterials II; (2003) https://doi.org/10.1117/12.506722
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

The electron transfer (ET) from organic dye molecules to semiconductor-colloidal systems is characterized by a special energetic situation with a charge transfer reaction from a system of discrete donor levels to a continuum of acceptor states. If these systems show a strong electronic coupling they are amongst the fastest known ET systems with transfer times of less than 10 fs. In the first part a detailed discussion of the direct observation of an ET reaction with a time constant of about 6 fs will be given, with an accompanying argumentation concerning possible artifacts or other interfering signal contributions. In a second part we will try to give a simple picture for the scenario of such superfast ET reactions and one main focus will be the discussion of electronic dephasing and its consequences for the ET reaction. The actual ET process can be understood as a kind of dispersion process of the initially located electron into the colloid representing a real motion of charge density from the alizarin to the colloid.

Citation Download Citation

Robert Huber, Jacques E. Moser, Michael Gratzel, and Josef L. Wachtveitl "Beyond vibrationally mediated electron transfer: interfacial charge injection on a sub-10-fs time scale", Proc. SPIE 5223, Physical Chemistry of Interfaces and Nanomaterials II, (4 December 2003); https://doi.org/10.1117/12.506722

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