Jump to main content
Jump to site search

Issue 35, 2014
Previous Article Next Article

Ruthenium sensitizers having an ortho-dicarboxyl group as an anchoring unit for dye-sensitized solar cells: synthesis, photo- and electrochemical properties, and adsorption behavior to the TiO2 surface

Author affiliations

Abstract

A novel ruthenium sensitizer ((TBA)[Ru(3′,4′-dicarboxyterpyridine)(NCS)3], TBA = tetrabutylammonium, TUS-28) has been synthesized as an improved model sensitizer for (TBA)[Ru(4′-(3,4-dicarboxyphenyl)terpyridine)(NCS)3] (TUS-20). The molar absorptivity of TUS-28 in the whole visible region was smaller than that of TUS-20 due to the absence of the phenyl ring at the terpyridine ligand. On the other hand, the energy levels of HOMO and LUMO of TUS-28 were still suitable for effective electron transfer reactions in dye-sensitized solar cells (DSCs). TUS-28 did not show a superior adsorptivity to the TiO2 surface just like TUS-20, even though TUS-28 has an ortho-dicarboxyl group which is reported to be an efficient anchoring unit. ATR-IR measurements revealed that both carboxyl groups of TUS-28 participate in binding to the TiO2 surface just like TUS-20. Therefore, steric hindrance between the hydrogen atom at the 4-position of 3′,4′-dicarboxyterpyridine and the OH group at the TiO2 surface seems to retard the rapid adsorption, and to weaken the binding strength of TUS-28. The DSC with TUS-28 showed 8.2% conversion efficiency, which is higher than that of TUS-20 (7.5%). The Jsc value of the DSC with TUS-28 was larger than that of TUS-20 even though the amount of dye adsorption of TUS-28 was smaller than that of TUS-20. A more effective electron injection reaction is considered to contribute mainly to the efficiency improvement of TUS-28 since the path length of the electron injection from TUS-28 to the conduction band of the TiO2 is shorter than that of TUS-20 due to the absence of the phenyl ring.

Graphical abstract: Ruthenium sensitizers having an ortho-dicarboxyl group as an anchoring unit for dye-sensitized solar cells: synthesis, photo- and electrochemical properties, and adsorption behavior to the TiO2 surface

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 May 2014, accepted on 08 Jul 2014 and first published on 08 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01450B
Citation: Dalton Trans., 2014,43, 13208-13218
  •   Request permissions

    Ruthenium sensitizers having an ortho-dicarboxyl group as an anchoring unit for dye-sensitized solar cells: synthesis, photo- and electrochemical properties, and adsorption behavior to the TiO2 surface

    H. Ozawa, K. Fukushima, T. Sugiura, A. Urayama and H. Arakawa, Dalton Trans., 2014, 43, 13208
    DOI: 10.1039/C4DT01450B

Search articles by author

Spotlight

Advertisements