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Proceedings Paper

Study by Raman spectroscopy of the adsorption of Ru-bi and ter pyridinium complexes on nanocrystalline TiO2 during photoelectrochemical experiments
Author(s): Anne Hugot-Le Goff; Suzanne Joiret; Polycarpos Falaras; Michael Graetzel; Peter Pechy; Nick Vlakopoulos; Shaikh M. Zakeeruddin
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Paper Abstract

The adsorption on a titanium dioxide substrate of organic monolayers used in the nanocrystalline dye sensitized solar cells was investigated by Raman spectroscopy, owing to the high resonance effect in these molecules. During the polarization of TiO2 modified by Ru-bi or ter pyridinium compounds in a photoelectrochemical cell, an enhancement affect appeared, allowing us to scrutinize the part of the complex which is in contact with the substrate. This affect remains to a large extent unexplained; it could be attributed to SERRS (surface enhanced Raman resonance). Noticeable differences appeared in the function of the nature of the pyridil ligands. In the case of bipy, in addition to the `normal' (ground state) Raman bands, a new series of bands appeared which correspond to the particular ligand exchanging electrons with the substrate titanium atoms. The Raman intensity of these new peaks is directly related to the electric field (i.e., to the potential magnitude independently of its cathodic or anodic nature). In the case of terpy, the enhancement mechanism seems different. The similarity of the molecular configuration created by the adsorption with the radical anion formed by the excitation of the metal ligand charge transfer complex has to be emphasized. Very interesting prospects for the understanding of the adsorption mechanisms are therefore opened.

Paper Details

Date Published: 23 August 1995
PDF: 8 pages
Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); doi: 10.1117/12.217360
Show Author Affiliations
Anne Hugot-Le Goff, Univ. de Paris VI-Pierre et Marie Curie (France)
Suzanne Joiret, Univ. de Paris VI-Pierre et Marie Curie (France)
Polycarpos Falaras, Univ. de Paris VI-Pierre et Marie Curie (France)
Michael Graetzel, Swiss Federal Institute of Technology (Switzerland)
Peter Pechy, Swiss Federal Institute of Technology (Switzerland)
Nick Vlakopoulos, Swiss Federal Institute of Technology (Switzerland)
Shaikh M. Zakeeruddin, Swiss Federal Institute of Technology (Switzerland)


Published in SPIE Proceedings Vol. 2531:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV
Carl M. Lampert; Satyen K. Deb; Claes-Goeran Granqvist, Editor(s)

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