Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells
Nedelcu, M.; Lee, J.; Crossland, E.J.W.; Warren, S.C.; Christopher Orilall, M.; Guldin, S.; Huttner, S.; Ducati, C.; Eder, D.; Wiesner, U.B.; Steiner, U.; Snaith, H.J.
The morphology of TiO2 plays an important role in the operation of solid-state dye-sensitized solar cells. By using polyisoprene-block-ethyleneoxide (PI-b-PEO) copolymers as structure directing agents for a sol-gel based synthesis of mesoporous TiO2, we demonstrate a strategy for the detailed control of the semiconductor morphology on the 10 nm length scale. The careful adjustment of polymer molecular weight and titania precursor content is used to systematically vary the material structure and its influence upon solar cell performance is investigated. Furthermore, the use of a partially sp2 hybridized structure directing polymer enables the crystallization of porous TiO2 networks at high temperatures without pore collapse, improving its performance in solid-state dye-sensitized solar cells.
M. N., S. H., and U. S. acknowledge financial support from the European network ‘‘PolyFilm’’ under RTN-6. This work was in part funded by EPSRC, NSF (DMR-0404195) and KAUST. The sabbatical leave of U. W. was supported by the Leverhulme Trust and EPSRC. C. D. acknowledges the Royal Society for Funding. We thank Richard Friend for support.
The Royal Society of Chemistry
HOLE; TRANSPORT; METAL-OXIDES; FILMS; EFFICIENCY; ELECTRON; POLYMERS; TITANIA
Previously Published As
Soft Matter, 2009,5, 134-139