ECN publication
Long term stability of dye sensitized solar cells
Published by: Publication date:
ECN Solar Energy 21-9-2009
ECN report number: Document type:
ECN-M--09-019 Conference Paper
Number of pages: Full text:
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Presented at: 24th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 21-25 september 2009.

During accelerated lifetime testing of dye sensitized solar cells high temperature and intense illumination have been identified as critical stress factors. It is known that the choice of dye and electrolyte determines cell stability to a large extent. In this paper we have applied a combination of Z907 dye and a derivative of so called “Maxell electrolyte”, which supports optimal cell stability. Several ageing tests have been carried out at elevated temperatures (up to 80°C) in the dark and under illumination conditions. TiCl4 treatment of titanium dioxide is unexpectedly identified as an important factor to increase cell stability at high temperature. The nature of the nanoporous TiO2 film is greatly changed by this treatment. Interactions between the modified TiO2/dye/electrolyte also influence the sensitivity of the system towards moisture. It appears that the modification of TiO2 by means of a TiCl4 post treatment is essential to realize a stable cell.

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