SiO2 aerogel templated, porous TiO2 photoanodes for enhanced performance in dye-sensitized solar cells containing a Ni(III)/(IV) Bis(dicarbollide) shuttle

Tina C. Li, Francisco Fabregat-Santiago*, Omar K. Farha, Alexander M. Spokoyny, Sonia R. Raga, Juan Bisquert, Chad A. Mirkin, Tobin J. Marks, Joseph T. Hupp

*Corresponding author for this work

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

High-area photoanodes consisting of silica aerogels, overcoated by atomic-layer-deposited TiO2, were fabricated on transparent conducting oxide platforms for their use in dye-sensitized solar cells (DSCs) in a similar fashion as previously described. These films were characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, gas adsorption, and light and dark electrochemical impedance measurements. The use of aerogellated photoanodes in DSCs with a Ni(III/IV) bis(dicarbollide) redox shuttle results in a greater than 2-fold enhancement in photocurrent densities, in comparison to similar cells containing photoanodes constructed from TiO2 nanoparticles. This improvement in photocurrent is attributed to a combination of improved electron transport, increased recombination resistance across the TiO2/electrolyte interface, and increased light scattering within the aerogel films. As a result, DSC charge collection efficiencies with this comparatively fast exchanging outer-sphere redox couple are improved in the TiO2 aerogel templated photoanode.

Original languageEnglish (US)
Pages (from-to)11257-11264
Number of pages8
JournalJournal of Physical Chemistry C
Volume115
Issue number22
DOIs
StatePublished - Jun 6 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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