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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8811
DOIs
Publication statusPublished - 2013
EventPhysical Chemistry of Interfaces and Nanomaterials XII - San Diego, CA, United States
Duration: Aug 25 2013Aug 28 2013

Other

OtherPhysical Chemistry of Interfaces and Nanomaterials XII
CountryUnited States
CitySan Diego, CA
Period8/25/138/28/13

Keywords

  • Adsorption
  • Chenodeoxycholic acid
  • Coadsorbate
  • Coadsorption
  • DSC
  • Dye-sensitized solar cells
  • Molecular film
  • QCM-D

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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