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

Research output: Contribution to journalArticle

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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
Pages (from-to)11257-11264
Number of pages8
JournalJournal of Physical Chemistry C
Volume115
Issue number22
DOIs
Publication statusPublished - Jun 6 2011

Fingerprint

Aerogels
aerogels
solar cells
dyes
Photocurrents
photocurrents
gas spectroscopy
Gas adsorption
exchanging
impedance measurement
Silicon Dioxide
Light scattering
Oxides
Electrolytes
light scattering
platforms
Silica
electrolytes
Spectroscopy
Nanoparticles

ASJC Scopus subject areas

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

Cite this

SiO2 aerogel templated, porous TiO2 photoanodes for enhanced performance in dye-sensitized solar cells containing a Ni(III)/(IV) Bis(dicarbollide) shuttle. / Li, Tina C.; Fabregat-Santiago, Francisco; Farha, Omar K.; Spokoyny, Alexander M.; Raga, Sonia R.; Bisquert, Juan; Mirkin, Chad A.; Marks, Tobin J; Hupp, Joseph T.

In: Journal of Physical Chemistry C, Vol. 115, No. 22, 06.06.2011, p. 11257-11264.

Research output: Contribution to journalArticle

Li, Tina C. ; Fabregat-Santiago, Francisco ; Farha, Omar K. ; Spokoyny, Alexander M. ; Raga, Sonia R. ; Bisquert, Juan ; Mirkin, Chad A. ; Marks, Tobin J ; Hupp, Joseph T. / SiO2 aerogel templated, porous TiO2 photoanodes for enhanced performance in dye-sensitized solar cells containing a Ni(III)/(IV) Bis(dicarbollide) shuttle. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 22. pp. 11257-11264.
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