Understanding S-shaped current-voltage characteristics of organic solar cells

• Verfasst von: Saive, Rebecca [VerfasserIn]
• Verfasst von: Müller, Christian [VerfasserIn]
• Verfasst von: Schinke, Janusz [VerfasserIn]
• Verfasst von: Lovrinčić, Robert [VerfasserIn]
• Verfasst von: Kowalsky, Wolfgang [VerfasserIn]
• Titel: Understanding S-shaped current-voltage characteristics of organic solar cells
• Titelzusatz: direct measurement of potential distributions by scanning Kelvin probe
• Verf.angabe: Rebecca Saive, Christian Mueller, Janusz Schinke, Robert Lovrincic, and Wolfgang Kowalsky
• E-Jahr: 2013
• Jahr: 11 December 2013
• Umfang: 3 S.
• Fussnoten: Gesehen am 26.01.2022
• Titel Quelle: Enthalten in: Applied physics letters
• Ort Quelle: Melville, NY : American Inst. of Physics, 1962
• Jahr Quelle: 2013
• Band/Heft Quelle: 103(2013), 24, Artikel-ID 243303, Seite 1-3
• ISSN Quelle: 1077-3118
• DOI: doi:10.1063/1.4846615
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1787165884

Abstract

We present a comparison of the potential distribution along the cross section of bilayer poly(3-hexylthiophene)/1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 (P3HT/PCBM) solar cells, which show normal and anomalous, S-shaped current-voltage (IV) characteristics. We expose the cross sections of the devices with a focussed ion beam and measure them with scanning Kelvin probe microscopy. We find that in the case of S-shaped IV-characteristics, there is a huge potential drop at the PCBM/Al top contact, which does not occur in solar cells with normal IV-characteristics. This behavior confirms the assumption that S-shaped curves are caused by hindered charge transport at interfaces.