Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)
O 59.9: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P3
Combined study of interface and device properties of a solid state dye sensitized solar cell — •Julia Maibach, René Hock, Thomas Mayer, and Wolfram Jaegermann — Technische Universität Darmstadt, Department of Material Science, Surface Science Devision, Petersenstr. 32, 64287 Darmstadt
We present the combined photoelectron spectroscopic and photoelectric characterization of a solid state dye sensitized solar cell (SDSC). The aim of this study is the development of a model system that allows a direct correlation of PES determined interface properties to global IV-measurements of the complete optoelectronic device.
The samples consist of a nanoporous TiO2 layer on FTO, which was sensitized with a metal free organic dye developed by BASF. As a hole transport material spiro-OMeTAD doped with the organic salt Li-TFSI was used. Both the dye and the hole conductor were applied via drop coating at normal pressure under clean Ar atmosphere within a glass cell integrated to the UHV system. The TiO2/dye and the TiO2/dye/spiro-OMeTAD interfaces were characterized using synchrotron induced photoelectron spectroscopy (SXPS) at BESSY. From these measurements the band diagram of the energy converting interface is derived which shows that driving forces for the relevant charge transfer processes are given in the investigated TiO2/dye/spiro-OMeTAD system. To perform the IV-measurements a gold contact was sputtered on top of the hole conductor of the SXPS-sample. Despite the unusual preparation for a SDSC the resulting solar cell shows a photo current density of 0,72 mA/cm2 under AM1,5 illumination.