Programm Photovoltaik Ausgabe 2008 ... - Bundesamt für Energie BFE

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WP4.4 Dyes assessment
For evaluation of new dyes and dyes that have an adapted spectrum to convert light coming from the
FPC luminescence, 2 new molecules were investigated in small test dye solar cells, and compared
with the existing dyes “Ruthenium 535-bisTBA” (red colored) and the “Ruthenium-1H3TBA” (dark
green-black colored).
The Zn-porphyrine PCH-001 was also tested in small dye solar cells, as this dye absorbs around 680 nm,
well within the emission spectrum of the red colored flat plate concentrators (RED305 dye).
PCH-01 molecule with attaching
carboxylic groups required to
bind to the TiO2 nanocrystals
Blue line: absorption spectrum of PCH-001 in acetonitrile, red
line: luminescence of RED305 colored flat plate concentrator,
orange line: luminescence of yellow Y083 colored flat plate
concentrator
Dye solar cells (surface: 0.23cm 2 ) colored with the ruthenium dyes Ruthenium 535-bisTBA, the experimental
dye RD-1, “black-Dye” Ruthenium 620-1H3TBA and PCH-001 porphyrine have been made
and electrically characterized in simulated solar light from the CDM-1000 lamp giving 1000 W/m 2 , similar
to the AM1.5 spectrum.
An experimental ruthenium dye called “RD-1” was synthesized, based on a modified terpyridyl ligand,
provided by Dr. Reza Fallahpour of the University of Zürich in the framework of a collaborative project.
The best cell is made with the well known Ruthenium535-bisTBA dye, followed by the wider absorbing
Ruthenium 620-1H3TBA, giving the best photocurrents, but a lower voltage. Remarquably, PCH-001
gives an efficiency of 2.9 % despite the narrow absorption band in the red part of the visible spectrum,
around 680 nm.
FULLSPECTRUM, T. Meyer, Solaronix
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