Study by Raman spectroscopy of the adsorption of Ru-bi and ter pyridinium complexes on nanocrystalline TiO2 during photoelectrochemical experiments

Anne Hugot-Le Goff; Suzanne Joiret; Polycarpos Falaras; Michael Graetzel; Peter Pechy; Nick Vlakopoulos; Shaikh M. Zakeeruddin

doi:10.1117/12.217360

23 August 1995 Study by Raman spectroscopy of the adsorption of Ru-bi and ter pyridinium complexes on nanocrystalline TiO₂ during photoelectrochemical experiments

Anne Hugot-Le Goff, Suzanne Joiret, Polycarpos Falaras, Michael Graetzel, Peter Pechy, Nick Vlakopoulos, Shaikh M. Zakeeruddin

Author Affiliations +

Proceedings Volume 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV; (1995) https://doi.org/10.1117/12.217360
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

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Anne Hugot-Le Goff, Suzanne Joiret, Polycarpos Falaras, Michael Graetzel, Peter Pechy, Nick Vlakopoulos, and Shaikh M. Zakeeruddin "Study by Raman spectroscopy of the adsorption of Ru-bi and ter pyridinium complexes on nanocrystalline TiO₂ during photoelectrochemical experiments", Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); https://doi.org/10.1117/12.217360

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