High-surface-area architectures for improved charge transfer kinetics at the dark electrode in dye-sensitized solar cells

William L. Hoffeditz, Michael J. Katz, Pravas Deria, Alex B.F. Martinson, Michael J. Pellin, Omar K. Farha, Joseph T. Hupp

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Dye-sensitized solar cell (DSC) redox shuttles other than triiodide/iodide have exhibited significantly higher charge transfer resistances at the dark electrode. This often results in poor fill factor, a severe detriment to device performance. Rather than moving to dark electrodes of untested materials that may have higher catalytic activity for specific shuttles, the surface area of platinum dark electrodes could be increased, improving the catalytic activity by simply presenting more catalyst to the shuttle solution. A new copper-based redox shuttle that experiences extremely high charge-transfer resistance at conventional Pt dark electrodes yields cells having fill-factors of less than 0.3. By replacing the standard Pt dark electrode with an inverse opal Pt electrode fabricated via atomic layer deposition, the dark electrode surface area is boosted by ca. 50-fold. The resulting increase in interfacial electron transfer rate (decrease in charge-transfer resistance) nearly doubles the fill factor and therefore the overall energy conversion efficiency, illustrating the utility of this high-area electrode for DSCs

Original languageEnglish
Pages (from-to)8646-8650
Number of pages5
JournalACS Applied Materials and Interfaces
Volume6
Issue number11
DOIs
Publication statusPublished - Jun 11 2014

Keywords

  • dark electrode
  • dye cell
  • fill factor
  • inverse opal

ASJC Scopus subject areas

  • Materials Science(all)

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