The 2,2,6,6-tetramethyl-l-piperidinyloxy radical: An efficient, iodine-free redox mediator for dye-sensitized solar cells

Zhipan Zhang, Chao-Yu Chen, Takurou N. Murakami, Shaik M. Zakeeruddin, Michael Grätzel

Research output: Contribution to journalArticlepeer-review

215 Citations (Scopus)

Abstract

A promising redox system, offering an alternative to the widely used iodide/triiodide couple, based on the stable organic radical 2,2,6,6-tetramethyl-1-piperidinytoxy (TEMPO) has been employed in dye-sensitized solar cells. The photovoltaic performance of this new redox couple has been evaluated by employing nanocrystalline TiO2 films with different thickness. Judicious selections of a 5.0 μm photoanode made from TiO 2 mesoscopic particles and an organic sensitizer with a high molar extinction coefficient yield an overall sokr-to-electric power conversion efficiency of 5.4 % under AM 1.5 illumination at 100 mW cm-2, which is unprecedented for an iodine-free mediator system.

Original languageEnglish
Pages (from-to)341-346
Number of pages6
JournalAdvanced Functional Materials
Volume18
Issue number2
DOIs
Publication statusPublished - 2008 Jan 24

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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