In-situ investigation of adsorption of dye and coadsorbates on TiO 2 films using QCM-D, fluorescence and AFM techniques

Type
Conference Paper

Authors
Harms, Hauke A.
Tétreault, Nicolas
Voitchovsky, Kislon
Stellacci, Francesco
Grätzel, Michael

KAUST Grant Number
KUS-C1-015- 21

Date
2013-09-11

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. © 2013 SPIE.

Citation
Harms HA, Tétreault N, Voitchovsky K, Stellacci F, Grätzel M (2013) In-situ investigation of adsorption of dye and coadsorbates on TiO 2 films using QCM-D, fluorescence and AFM techniques . Physical Chemistry of Interfaces and Nanomaterials XII. Available: http://dx.doi.org/10.1117/12.2024194.

Acknowledgements
This work was supported by the Swiss National Science Foundation (Grant No. 200020-134856/1) and partially based onwork supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1-015- 21), made by KingAbdullah University of Science and Technology (KAUST). We thank S. M. Zakeeruddin, C. Yi and J. Delcamp forsynthesizing the sensitizers, as well as F. Andersson at Q-Sense (Biolin Scientific) and B. Kasemo at ChalmersUniversity for assistance during the initial measurements and for discussions. Hauke Harms thanks Biolin Scientific for aconference travel grant. MG thanks the European Science Foundation for research support under the MesolightAdvanced Research Grant (Mesolight).

Publisher
SPIE-Intl Soc Optical Eng

Journal
Physical Chemistry of Interfaces and Nanomaterials XII

DOI
10.1117/12.2024194

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