Mesostructured self-assembled titania films for photovoltaic applications

Luca Malfatti, Paolo Falcaro, Heinz Amenitsch, Stefano Caramori, Roberto Argazzi, Carlo Alberto Bignozzi, Stefano Enzo, Michele Maggini, Plinio Innocenzi*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Mesostructured titania thick films were tested as photovoltaic materials to be used for the fabrication of Grätzel-type dye-sensitized solar cells. The titania films, prepared by evaporation-induced self-assembly, showed a 3D orthorhombic porous mesostructure obtained using non-ionic tri-block copolymers as templating agents and controlled conditions of processing. Thick films (up to 1 μm) were synthesized via repetitive dip-coating. Grazing incidence small angle X-ray scattering and X-ray diffraction analysis showed that, after calcination at temperatures higher than 350 °C, anatase crystallites were formed in the titania pore walls without loss of organization. The block copolymers were removed after thermal calcination at 350 °C, as shown by infrared spectroscopy. Photoaction spectra of 1 μm thick films, treated at 350 °C, exhibited an incident photon-to-current efficiency above 40% at λ = 380 nm.

Original languageEnglish
Pages (from-to)304-311
Number of pages8
JournalMicroporous and mesoporous materials
Volume88
Issue number1-3
DOIs
Publication statusPublished - 21 Jan 2006
Externally publishedYes

Keywords

  • Films
  • Self-assembly
  • Solar cells
  • Titania

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

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