期刊
CHEMISTRY LETTERS
卷 39, 期 5, 页码 464-465出版社
CHEMICAL SOC JAPAN
DOI: 10.1246/cl.2010.464
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资金
- MEXT, Japan [19105003, 21106519]
- Advanced Research Institute for Science & Engineering, Waseda University
- Grants-in-Aid for Scientific Research [21106519, 19105003] Funding Source: KAKEN
A robust nitroxide radical, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and its 4-subsituted derivatives (R-TEMPO) exhibit electrochemically reversible redox properties with tunable half-wave potentials (E-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 (V-oc) and E-1/2 revealed that V-oc dominated by the energy gap between the Fermi level of TiO2 and the SOMO level of R-TEMPO.
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