Photoconductivity as loss mechanism in organic solar cells. Issue 6 (24th April 2013)

• Record Type: Journal Article
• Authors: Tress, Wolfgang; Leo, Karl; Riede, Moritz
• Is Part Of: Physica status solidi. Volume 7:Issue 6(2013:Jun.)
• Page Start: 401
• Page End: 405
• Publication Date: 2013-04-24
• Subjects: Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201307039
• Languages: English
• ISSNs: 1862-6254

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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. (© 2013 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)</p> </abstract>