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  4. Parameter study on UV-induced degradation of dye-sensitized solar cells
 
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2013
Journal Article
Title

Parameter study on UV-induced degradation of dye-sensitized solar cells

Abstract
The present work investigates the UV stability of the dye-sensitized solar cell (DSC) by parametrical investigation of the material influence on UV stability. UV illumination has been observed to cause degradation by slow photocatalysis in the DSC. Photooxidized impurities represent an unwanted side reaction with the redox pair of the electrolyte as the released electron will deplete the triiodide concentration. A study on the DSC cell was carried out with intermediate electrical characterization by cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) to map the influence of UV illumination as a function of the H2O concentration in the electrolyte, the plate distance and the triiodide concentration. The results show that the H2O content has a detrimental influence on the DSC stability during UV illumination. A higher concentration of triiodide can buffer the reaction with impurities, so that a longer-term stability is achieved. A recovery of triiodide in UV aged cells with either no remaining triiodide or with such a low concentration that the cell current has been diffusionlimited, was seen during CV to -0.75 V under illumination. The reappearance of triiodide was accompanied with a production of hydrogen bubbles, which was related to the H2O content in the electrolyte and the exposure to UV. Our approach can be used to test the purity and the UV stability of various electrolytes.
Author(s)
Flarup Jensen, Katrine
Veurman, Welmoed
Brandt, H.
Im, C.
Wilde, Jürgen
Hinsch, Andreas  
Journal
MRS online proceedings library. Online resource  
Conference
Materials Research Society (Spring Meeting) 2013  
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Solarzellen - Entwicklung und Charakterisierung

  • Farbstoff

  • Organische und Neuartige Solarzellen

  • Alternative Photovoltaik-Technologien

  • Farbstoffsolarzellen

  • Farbstoff- und Organische Solarzellen

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