| AVS 54th International Symposium | |
| Renewable Energy Science & Technology Topical Conference | Thursday Sessions |
| Session EN+SS+TF-ThM |
| Session: | Surface Science Challenges for Solar Energy Conversion |
| Presenter: | H.J. Kim, University of Wisconsin-Madison |
| Authors: | H.J. Kim, University of Wisconsin-Madison E.C. Landis, University of Wisconsin-Madison S.H. Cheung, Pacific Northwest National Laboratory S.A. Chambers, Pacific Northwest National Laboratory T.F. Kuech, University of Wisconsin-Madison R.J. Hamers, University of Wisconsin-Madison |
| Correspondent: | Click to Email |
Molecular interfaces to TiO2 are an important component of dye-sensitized solar cells and other emerging systems for solar-to-electrical and solar-to-fuel conversion. Using X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy,we demonstrate that organic alkenes will link to the surfaces of titanium dioxide in both anatase and rutile forms when illuminated with ultraviolet light. This provides a versatile way to covalently link functional organic molecules directly to oxide semiconductors. Measurements have been performed on epitaxial thin films of anatase (001), bulk crystals of anatase(101), rutile (001), rutile (110), and nanocrystalline anatase. Quantitative XPS measurements have been used to investigate the kinetics of functionalization and its dependence on the structure of the bulk samples and the dependence on exposed crystal face. We will compare the functionalization of these surfaces and discuss the mechanism of the modification. Implications for tethering of photochemically active molecules to these surfaces will be discussed.