Berlin 2008 – wissenschaftliches Programm
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.54: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Block-copolymer directed mesoporous TiO2 for solar cell applications — Mihaela Nedelcu1, •Stefan Guldin1, 4, Sven Hüttner1, Henry J. Snaith2, Jinwoo Lee3, Chris Orillal3, Scott Warren3, Ulrich Wiesner3, and Ullrich Steiner1 — 1Department of Physics, Cavendish Laboratory, University of Cambridge, UK — 2Department of Physics, University of Oxford, UK — 3Materials Science Department, University of Cornell, Ithaca, USA — 44 Physik Department, Technische Universität München, Garching, D
Nanostructuring metal-oxides through polymer-assisted self-assembly has gained significant interest in the last 10 years for a wide range of applications. Dye-sensitized solar cells, for example, rely on a highly porous, polycrystalline metal-oxide electrode.
In our work we used a Poly(isoprene)-b-Poly(ethylenoxide) (PI-b-PEO) diblock-copolymer as a structure-directing agent for the formation of TiO2. The block-copolymer phase separates into ordered domains, tens of nanometers in size. Titania precursors were incorporated through a non hydrolytic sol-gel route which swell only the hydrophilic PEO.
During temperature annealing the PI-block forms a carbon scaffold which enables high temperatures for the crystallisation of TiO2 without loss of the mesostructure. This leads to a nanostructured material with improved crystallinity and a high surface area.
The benefits of these interesting material properties are presented in efficient dye-sensitized solar cells.