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Photoconductivity as loss mechanism in organic solar cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Technical University of Dresden, Germany .
Technical University of Dresden, Germany .
2013 (English)In: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, Vol. 7, no 6, 401-405 p.Article in journal (Refereed) Published
Abstract [en]

We observe that the reverse current under illumination in solar cells containing C60 and ZnPc is dominated by a photoshunt. This shunt, not present in the dark, causes a linear current-voltage relation under illumination showing no saturation. Although observable in bulk heterojunctions, this effect is more pronounced in the presence of a pristine C60 layer. An internal quantum efficiency larger than unity under an applied negative voltage and in the spectral range where C60 absorbs identifies charges which are injected in addition to those photogenerated. The photoshunt is also present in the power-generating region and represents a loss mechanism limiting the fill factor in particular for flat heterojunction devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2013. Vol. 7, no 6, 401-405 p.
Keyword [en]
photoshunt; organic solar cells; internal quantum efficiency; photoconductivity
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-96482DOI: 10.1002/pssr.201307039ISI: 000320174900007OAI: diva2:642891
Available from: 2013-08-23 Created: 2013-08-20 Last updated: 2013-08-23

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Tress, Wolfgang
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Biomolecular and Organic ElectronicsThe Institute of Technology
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