8-12 July 2013
Ultrafast photodynamics of charge transfer reactions in Indoline-sensitized ZnO solar cells
Presented by Mr. Egmont ROHWER on 9 Jul 2013 from 15:40 to 16:00
Type: Oral Presentation
Track: Track C - Photonics
The surprising efficiency of some dye-sensitized solar cells is largely attributed to the ultrafast efficient electron injection from the photo-excited state of the dye to the conduction band of the semiconductor. Femtosecond transient absorption spectroscopy measurements conducted on indoline-sensitized ZnO solar cells reveal this combination to be no exception. Primary charge transfer occurs on the 100 fs time scale. The measurements also reveal the rates of competing decay mechanisms and the regeneration rate of dye molecules after oxidation. The effect of different redox couples on the operation of the cell and the effect of an external potential, as under working conditions, on the primary charge transfer is discussed.
Prof. Heinrich Schwoerer