Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.5: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Silicon organic dye composites for photovoltaic applications — •Andreas Decker1, Ulrich Weiler2, Maxime Monnoyer3, Thomas Mayer1, and Wolfram Jaegermann1 — 1Darmstadt University of Technology, Institute of Materials Science, Surface Science Division — 2now Calyxo GmbH, Thalheim — 3now Arcelor, Lüttich
We have introduced the concept of bulk sensitization of the indirect semiconductor Si with direct absorbing organic dye molecules in order to enhance light absorption and decrease absorber film thickness in thin film µc-Si solar cells. With Raman spectroscopy it was shown that the pigments like ZnPc are not damaged by the hot wire activated µc-Si CVD from hydrogen diluted silane. Photoemission measurements prove the band line up of F4ZnPc and F8ZnPc to provide a driving force for the hole as well as electron transfer from the dye to the Si valence and conduction band respectively.
In a first attempt towards an electronic device films of bulk sensitized Si have been deposited on p+ doped µc-Si substrates and Au back contacts have been sputter deposited. In the composites optical transmission shows absorptivity of the pigments. Due to pinholes that were detected by AFM, results of I-V curves measured in the dark and under illumination are not yet representative of the film characteristics.