Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.40: Poster
Donnerstag, 14. März 2013, 17:00–20:00, Poster B2
Ultrafast Photodynamics of the Indoline Dye D149 Adsorbed to Porous ZnO in Dye-Sensitized Solar Cells — •Nadine Heming1,2, Egmont Rohwer1, Christoph Richter3, Christian Litwinski4, Derck Schlettwein3, and Heinrich Schwoerer1 — 1Laser Research Institute, Stellenbosch University, South Africa — 2Leibniz Institute for Solid State and Materials Research Dresden, Dresden University of Technology, Germany — 3Institute for Applied Physics, Justus-Liebig-Universität, Gießen, Germany — 4Chemistry Department, Rhodes University, South Africa
Research in the field of dye-sensitized solar cells (DSCs) has been driven by a desire to develop versatile, sustainable and affordable sources of electrical energy. We investigate photoinduced electron transfer dynamics between surface-adsorbed Indoline D149 and porous ZnO as used in working electrodes of dye-sensitized solar cells via femtosecond transient absorption spectroscopy. In the transient absorption spectra of dye D149 in solution, we found lifetimes of the excited state absorption (ESA) of 300 ± 50 ps. The absorption spectra of the dye adsorbed to ZnO shows a faster component, which is severely quenched to decay times of 150 ± 20 fs and can be assigned to the electron-transfer from the dye molecules to the semiconductor. Transient absorption spectroscopy was also conducted on the working electrode in contact with different electrolytes. The adsorption bands of the oxidized dye molecules show regeneration times in the excess of 1 ns and are shortened by the presence of electrolytes.