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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 5: Poster
SYOH 5.46: Poster
Donnerstag, 11. März 2004, 18:00–21:00, B
Multilayer solar cells based on polymer nanoparticles — •Thomas Kietzke1, Katharina Landfester2, and Dieter Neher2 — 1University of Potdam, Institute of Physics, Am Neuen Palais 10, D-14469 Potsdam — 2University of Ulm, Institute of Macromolecular Chemistry, Albert-Einstein-Allee 11, D-89069 Ulm
Recently, we have demonstrated that polymer nanospheres with diameters in the range of 30 to 250 nm dispersed in water can be prepared with the miniemulsion process. First solar cells based on layers of these nanoparticles have shown efficiencies comparable to solvent processed layers. Formation of films from polymer nanoparticles opens up new strategies for the deposition of multilayer assemblies, since the semiconducting polymer nanospheres are dispersed in water. Preparing multilayer structures of polymers from organic solvents is often difficult if the polymers of e.g. the second layer is deposited from a solvent, which is also a good solvent for the underlying polymer. Utilizing dispersions of polymer nanospheres can help to circumvent this problem. After preparing the first nanoparticle layer, the sample is thoroughly dried to completely remove residual water. Then, a second nanosphere layer is deposited on top, resulting in a multilayer assembly with a well-defined polymer-polymer interface and no interdiffusion of the polymers in the separate layers. We show the results on double layer polymer solar cells with ITO and Ca electrodes as well as devices including a thin TiO2 electron-accepting layer. Reference: [1] T.Kietzke, D. Neher et. al. Nature Materials, June 2003, 408-412