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Out-door testing and long-term stability of plastic solar cells*

Published online by Cambridge University Press:  10 January 2007

E. A. Katz ,
S. Gevorgyan ,
M. S. Orynbayev  and
F. C. Krebs
E. A. Katz*
Affiliation:
Dept. of Solar Energy and Environmental Physics, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker Campus 84990, Israel Ilse-Katz Center for Meso- and Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
S. Gevorgyan
Affiliation:
Dept. of Solar Energy and Environmental Physics, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker Campus 84990, Israel
M. S. Orynbayev
Affiliation:
Dept. of Solar Energy and Environmental Physics, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker Campus 84990, Israel
F. C. Krebs
Affiliation:
The Danish Polymer Centre, RISØ National Laboratory, PO Box 49, 4000 Roskilde, Denmark
*
[email protected]
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Abstract

In spite of the high potential of polymer photovoltaic (PV) cells, considerable improvement of their stability under operational conditions needs to be achieved. The few published data on the stability of such cells are devoted to accelerated indoor testing at elevated temperatures. The acceleration factor is undoubtedly dependent on the PV materials, the cell architecture and may vary with the degradation. We report preliminary results of long-term evaluation of PV performance of polymer cells under real sun operational conditions. The studied devices include three types of encapsulated polymer/fullerene cells which differed by the configuration and content of the photoactive layer: (1) bulk heterojunction of MEH-PPV:PCBM; (2) bulk heterojunction of P3HT:PCBM; (3) bilayer heterojunction P3CT-C60. The MEHPPV-PCBM cell exhibited the fastest degradation. The degradation of PV performance of the P3HT-PCBM cell was much slower while the P3CT-C60 device was found to be the most stable. Effect of restoration of I sc and V oc was found when the P3HT-PCBM and P3CT-C60 cells were kept in the dark overnight. The first I sc and V oc measurements every morning yielded the highest values compared to those during the rest of a day. While I sc recovered only partly and exhibited significant degradation during a month, V oc values recovered completely every night and showed almost no reduction on a long-term time scale.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 36 , Issue 3 , December 2006 , pp. 307 - 311
Copyright
© EDP Sciences, 2006

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Footnotes

*

This paper has been presented at “ECHOS06”, Paris, 28–30 juin 2006.

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