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Proceedings Paper

Recent developments in solid-state dye-sensitized photovoltaic devices based on spiro-MeOTAD
Author(s): Jessica Krueger; Robert Plass; Hans J. Matthieu; Michael Graetzel
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Paper Abstract

The photovoltaic performance of solid-state dye-sensitized solar cells based on spiro-MeOTAD (2,2'7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene) has been improved to 3.2% overall conversion efficiency under air mass AM 1.5 illumination by performing the dye adsorption in the presence of silver ions in the dye solution. Different spectroscopic methods, such as X-ray photoelectron, Fourier-transform infrared and UV-visible spectroscopy have been employed to scrutinize the impact of the silver on the dye-sensitized device. From spectroscopic evidence it is inferred that the silver binds to the sensitizer mainly via the amphidentate thiocyanate, allowing the formation of ligand-bridged dye complexes. The enhancement in overall device efficiency is a result of increased open circuit potential and short circuit current. The increased open circuit voltage was explained by the blocking of the dark current as a result of a closer packed dye layer and/or the partial formation of a dye double layer upon silver coordination. The increased short circuit current corresponds to the higher amount of ruthenium dye units adsorbed to the TiO2 surface.

Paper Details

Date Published: 26 February 2003
PDF: 11 pages
Proc. SPIE 4801, Organic Photovoltaics III, (26 February 2003); doi: 10.1117/12.459046
Show Author Affiliations
Jessica Krueger, Swiss Federal Institute of Technology (Switzerland)
Robert Plass, Swiss Federal Institute of Technology (Switzerland)
Hans J. Matthieu, Swiss Federal Institute of Technology (Switzerland)
Michael Graetzel, Swiss Federal Institute of Technology (Switzerland)


Published in SPIE Proceedings Vol. 4801:
Organic Photovoltaics III
Zakya H. Kafafi, Editor(s)

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