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Parameter Study on UV-induced Degradation of Dye-sensitized Solar Cells

Published online by Cambridge University Press:  20 June 2013

Katrine Flarup Jensen ,
Welmoed Veurman ,
Henning Brandt ,
Chan Im ,
Jürgen Wilde  and
Andreas Hinsch
Katrine Flarup Jensen
Affiliation:
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany Konkuk University-Fraunhofer Next Generation Solar Cell Research Center (KFnSC), 120 Neungdong-ro, Gwangjin-gu, Seoul 143-701, Korea
Welmoed Veurman
Affiliation:
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
Henning Brandt
Affiliation:
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
Chan Im
Affiliation:
Konkuk University-Fraunhofer Next Generation Solar Cell Research Center (KFnSC), 120 Neungdong-ro, Gwangjin-gu, Seoul 143-701, Korea
Jürgen Wilde
Affiliation:
Department of Microsystems Engineering – IMTEK, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
Andreas Hinsch*
Affiliation:
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
*
*Email: [email protected]
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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.

Keywords

photovoltaicphotochemicaldefects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1537: Symposium B – Organic and Hybrid Photovoltaic Materials and Devices , 2013 , mrss13-1537-b11-14
Copyright
Copyright © Materials Research Society 2013 

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