Electron transport in coumarin-dye-sensitized nanocrystalline TiO2 electrodes

被引：150

作者：

Hara, K

Miyamoto, K

Abe, Y

Yanagida, M

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan

[2] Tokyo Univ Sci, Fac Sci & Technol, Noda, Chiba 2788510, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 50期

关键词：

D O I：

10.1021/jp055572q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigated electron transport kinetics in terms of electron diffusion coefficient (D) and electron lifetime (T) in coumarin-dye-sensitized nanocrystalline TiO2 electrodes by intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS). We found that the values of tau for coumarin-dye-sensitized TiO2 electrodes were much shorter than that for an electrode coated with a Ru complex (N719 dye), suggesting that the back-electron-transfer process corresponding to recombination between conduction-band electrons in the TiO2 and I-3(-) ions in the electrolyte occurs more easily in coumarin-dye-sensitized solar cells. In addition, the values of tau depended on the kind of coumarin dye, each of which has a different number of thiophene moieties, suggesting that the molecular structure of the adsorbed dyes also affects the kinetics of electron transport in the TiO2 electrodes.

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页码：23776 / 23778

页数：3

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