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 4.55: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Study of the Performance of Hybrid Solar Cells Incorporating Dense TiO2 Layers — •Sylvia Paul and Dieter Neher — University of Potsdam, Institute of Physics, Karl-Liebknecht- Street 25, 14476 Potsdam, Germany

Hybrid solar cells combine an organic with a suitable inorganic semiconductor (TMO*s). Hereby, the morphology and surface characteristics of the TiO2-films are of great importance, as they affect the exciton diffusion length and carrier transport properties of the TMO in the inorganic/polymeric hybrid-cell. It is expected that the way of layer preparation has a large impact on these properties. We have systematically investigated different techniques for the preparation of the TiO2 layers with regard to the performance of hybrid photovoltaic cells using a soluble derivative of PPV as the hole acceptor. The following processes were applied: TiO2 layers compounded via sputtering, dip-coating of preformed crystalline nanoparticles, dip-coating of preformed TiO2 by sol-gel process and the combination of all methods. Structural characteristics were investigated by atomic force microscopy (AFM), transmissions electron microscope (TEM), scanning electron microscope (SEM), infrared and Raman spectroscopy while the optical properties were studied with ellipsometry. In particular we show that dense and defect-free layers could be prepared from preformed crystalline TiO2 nanoparticles and that these layers, in combination with a sol-gel buffer substrate layer, gave the best performance in our hybrid photovoltaic devices: an open circuit voltage Voc of approximately 0.9 V and a fill factor of more than 40%.