Tof-gisans investigation of polymer infiltration in mesoporous TiO 2 films for photovoltaic applications

Gunar Kaune, Martin Haese-Seiller, Reinhard Kampmann, Jean Francois Moulin, Qi Zhong, Peter Müller-Buschbaum

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The structure of porous TiO2 films and TiO2: poly(Nvinylcarbazole) (PVK) composite films is investigated with time-offlight grazing incidence small-angle neutron scattering (TOFGISANS). The TiO 2 films have been prepared by application of a sol-gel process with a diblock copolymer as structure directing agent, and the conductive polymer PVK is infiltrated in the porous network by spin coating and solution casting. The films showa hierarchical pore structurewith mesopores 52 nm in size and additional large macropores with a diameter of about 180 nm. By matching the scattering contrast of the TiO2 with the polymer information about the penetration of the polymer in the pores is determined. Whereas in the PVK film prepared by solution casting the pores are filled to a high degree; in the spin coated film, PVK wets only the TiO2 pore walls and forms a solid overlying layer.

Original languageEnglish
Pages (from-to)1628-1635
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume48
Issue number14
DOIs
StatePublished - 15 Jul 2010

Keywords

  • Composites
  • Conducting polymers
  • GISANS
  • Neutron scattering
  • Titanium dioxide

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