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Proceedings Paper

In-situ investigation of adsorption of dye and coadsorbates on TiO2 films using QCM-D, fluorescence and AFM techniques
Author(s): Hauke A. Harms; Nicolas Tétreault; Kislon Voitchovsky; Francesco Stellacci; Michael Grätzel
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Paper Abstract

Simultaneous adsorption of dye molecules and coadsorbates is important for the fabrication of high-efficiency dyesensitized solar cells, but its mechanism is not well understood. Herein, we use a quartz crystal microbalance with dissipation technique (QCM-D) to study dynamically and quantitatively the sensitization of TiO2 in situ. We investigate dye loading for a ruthenium(II) polypyridyl complex (Z907), of a triphenylamine-based D-π-A dye (Y123), and of a ullazine sensitizer (JD21), as well as the simultaneous adsorption of the latter two with the coadsorbate chenodeoxycholic acid. By combining the QCM-D technique with fluorescence measurements, we quantify molar ratios between the dye and coadsorbate. Furthermore, we will present first studies using liquid-phase AFM on the adsorbed dye monolayer, thus obtaining complementary microscopic information that may lead to understanding of the adsorption mechanism on the molecular scale.

Paper Details

Date Published: 11 September 2013
PDF: 8 pages
Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 88110C (11 September 2013); doi: 10.1117/12.2024194
Show Author Affiliations
Hauke A. Harms, École Polytechnique Fédérale de Lausanne (Switzerland)
Nicolas Tétreault, École Polytechnique Fédérale de Lausanne (Switzerland)
Kislon Voitchovsky, École Polytechnique Fédérale de Lausanne (Switzerland)
Francesco Stellacci, École Polytechnique Fédérale de Lausanne (Switzerland)
Michael Grätzel, École Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 8811:
Physical Chemistry of Interfaces and Nanomaterials XII
Natalie Banerji; Carlos Silva, Editor(s)

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