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Thiocyanate‐Free versus Thiocyanate‐Containing Dyes for TiO 2 ‐Based Dye‐Sensitized Solar Cells
Author(s) -
Neuthe Katja,
Brandt Henning,
Hinsch Andreas,
Tzschucke C. Christoph,
Veurman Welmoed,
Ziem Benjamin,
Haag Rainer
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402078
Subject(s) - thiocyanate , dye sensitized solar cell , photochemistry , absorption (acoustics) , chemistry , electrochemistry , indoline , ruthenium , absorption spectroscopy , homo/lumo , adsorption , conjugated system , ultrafast laser spectroscopy , bipyridine , inorganic chemistry , materials science , spectroscopy , organic chemistry , molecule , polymer , electrode , crystal structure , electrolyte , optics , physics , composite material , catalysis , quantum mechanics
The synthesis and properties of four new ruthenium dyes for TiO 2 ‐based dye‐sensitized solar cells are presented. Bipyridine ligands with triarylamine or indoline moieties as donors, which differ both in the size of their conjugated π systems and in their hydrophobicity, have been introduced into thiocyanate (SCN)‐free and SCN‐containing complexes. The structural changes affect the absorption and electrochemical properties. Extension of the π conjugation leads to a shift in the absorption maximum to longer wavelengths, a broadening of the absorption spectra, and a decrease in the energy of the lowest unoccupied molecular orbital. The efficiency of TiO 2 ‐based solar cells that have been sensitized with the new complexes is mainly affected by the adsorption behavior of the dyes. The SCN‐containing complex with the less‐substituted or extended donor outperforms the other dyes.