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

46 Citations (Scopus)

Abstract

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
Volume39
Issue number5
DOIs
Publication statusPublished - 2010

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Iodides
Open circuit voltage
Fermi level
Energy gap
Derivatives
Electrons
nitroxyl
Oxidation-Reduction
2,2,6,6-tetramethylpiperidide
Dye-sensitized solar cells

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Nitroxide radicals for highly efficient redox mediation in dye-sensitized solar cells. / Kato, Fumiaki; Hayashi, Naoki; Murakami, Takaya; Okumura, Chie; Oyaizu, Kenichi; Nishide, Hiroyuki.

In: Chemistry Letters, Vol. 39, No. 5, 2010, p. 464-465.

Research output: Contribution to journalArticle

Kato, Fumiaki ; Hayashi, Naoki ; Murakami, Takaya ; Okumura, Chie ; Oyaizu, Kenichi ; Nishide, Hiroyuki. / Nitroxide radicals for highly efficient redox mediation in dye-sensitized solar cells. In: Chemistry Letters. 2010 ; Vol. 39, No. 5. pp. 464-465.
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