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observed from the absorption spectra of the dyes on TiO2 (see
the Supporting Information) and a resulting less efficient
electron injection process, even if the dye loading measurements
have shown an amount of adsorbed dye comparable or also
greater for [Ru(Tetrazpy)(dcbpy)2]Cl (5.1 × 10−8 mol cm−2)
with respect to N719 (4.1 × 10−8 mol cm−2).
The achievement of 3% efficiency is remarkable for the first
member of this new family of dyes. The use of highly π-
delocalized substituted 5-(pyrid-2-yl)tetrazoles should enhance
solar light harvesting, improving the cell’s efficiency. The
efficiency for [Ru(ppy)(dcbpy)2]+ (ppy = phenylpyridine) is
2%,19b whereas that of related complexes with adequately
substituted ppy is much higher19 and, in one case, reaches 10%.16
In conclusion, our work unveils the potential of a new class of
ruthenium complexes for convenient DSSCs. The first member
gives a good efficiency that will be surely improved in the near
future by using adequately substituted 5-(pyrid-2-yl) moieties.
ASSOCIATED CONTENT
* Supporting Information
■
S
Materials, synthesis, computational details, solar cell fabrication
and characterization, and electrochemical characterization. This
material is available free of charge via the Internet at http://pubs.
AUTHOR INFORMATION
Corresponding Authors
■
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
■
This work was supported by Fondazione Cariplo (Grant 2010-
0525) and by MIUR (FIRB 2004: RBPR05JH2P). P.S., M.G.L.,
and F.D. are also thankful for FP7-ENERGY-2010 Project
261920 “ESCORT” for financial support.
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