Dresden 2003 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.63: Poster

Montag, 24. März 2003, 19:00–21:00, ZEU/250

Confocal Raman Investigations of Dye-Sensitized Solid-State Organic Solar Cells — •Carmen Pérez León¹, Claus Jäger¹, Bin Peng², Michael Häckel¹, and Lothar Kador¹ — ¹University of Bayreuth, Institute of Physics and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth — ²University of Bayreuth, Macromolecular Chemistry II, 95440 Bayreuth

We performed confocal Raman microscopy on dye-sensitized solid-state organic solar cells based on an organic hole transport layer and TiO₂. To identify characteristic Raman lines and assign them to vibrations of the different constituents, we investigated also cells in which only part of the materials were present. In the spectrum we could detect the Raman signal of the Ruthenium dye adsorbed on the TiO₂ nanoparticles, although the laser wavelength used for excitation (λ = 632.8 nm) is far from the absorption peak of the dye. We ascribe this observation to enhancement of the Raman signal and concomitant fluorescence quenching due to SERS. The spectrum shows also peaks which indicate the formation of new chemical bonds between the constituents. When the laser was focused on the evaporated gold electrodes, enhancement of some Raman lines due to SERS was observed.