16:00-17:00
Vibrational Spectroscopy of Photosensitizer Dyes for Organic Solar Cells & STM Investigation of Pulse-Injection Deposited Molecules on Cu(111)
Dr. Carmen Perez Leon(Advanced Scanning Probe Microscopy Group, Advanced Nano Characterization Center)
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Dye-sensitized solar cells consisting on a Ru-complex adsorbed on nanocrystalline layers of TiO2 show promising prospects for technological applications. These cells have a sandwich structure of TiO2/dye/electrolyte or hole conductor between two current-collecting electrodes. The energy conversion efficiency of the solar cell is strongly dependent on both the binding configuration of the dye and the morphology of the titania. In the first part of this talk, we will characterize two ruthenium bipyridiyl complexes by means of vibrational spectroscopy and we will clarify the role of the carboxylate groups in the anchoring process on titania.
One way of depositing macromolecules such as photosensitizer dyes on clean surfaces in UHV is by pulse injection. In the second part of the talk, we will discuss the results of our investigations by STM of the pulse deposition of large pi-conjugated oligomers on Cu(111). The effects of possible contamination with air will be also presented.