Nitroxide radicals for highly efficient redox mediation in dye-sensitized solar cells

Fumiaki Kato, Naoki Hayashi, Takaya Murakami, Chie Okumura, Kenichi Oyaizu, Hiroyuki Nishide

Research output: Contribution to journalArticle

47 Citations (Scopus)


A robust nitroxide radical, 2,2,6,6-tetramethylpiperidine-loxyl (TEMPO) and its 4-subsituted derivatives (R-TEMPO) exhibit electrochemically reversible redox properties with tunable half-wave potentials (£1/2) based on the substituent effect. Dye-sensitized solar cells using R-TEMPO as mediators with electron-withdrawing R groups showed significantly enhanced photovoltages compared with those obtained using iodides. The linearity between the open-circuit voltage (Vac) and £i/2 revealed that V00 was dominated by the energy gap between the Fermi level of TiO2 and the SOMO level of R-TEMPO.

Original languageEnglish
Pages (from-to)464-465
Number of pages2
JournalChemistry Letters
Issue number5
Publication statusPublished - 2010 May 3


ASJC Scopus subject areas

  • Chemistry(all)

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