Lifetimes of organic photovoltaics: Using TOF-SIMS and 18O2 isotopic labelling to characterise chemical degradation mechanisms

K. Norrman, Frederik C Krebs

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The lifetimes of organic photovoltaic cells based on conjugated polymer materials were studied. The device geometry was glass:ITO:PEDOT:PSS:C-12-PSV:C-60:aluminium. To characterise and elucidate the parts of the degradation mechanisms induced by molecular oxygen, 1802 isotopic labelling was employed in conjunction with time-of-flight secondary ion mass spectrometry. A comparison was made between devices being kept in the dark and devices that had been subjected to illumination under simulated sunlight (1000 W m(-2), AM1.5) and this demonstrated that oxygen-containing species were generated throughout the active layer with the largest concentration towards the aluminium electrode. For devices that had been kept in the dark oxygen species were only observed at the immediate interface between the aluminium and the organic layer. The isotopic labelling allowed us to demonstrate that the oxygen comes from the atmosphere and diffuses through the aluminium electrode and into the device. (c) 2005 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalSolar Energy Materials & Solar Cells
    Volume90
    Issue number2
    Pages (from-to)213-227
    ISSN0927-0248
    DOIs
    Publication statusPublished - 2006

    Fingerprint Dive into the research topics of 'Lifetimes of organic photovoltaics: Using TOF-SIMS and <sup>1</sup><sup>8</sup>O<sub>2</sub> isotopic labelling to characterise chemical degradation mechanisms'. Together they form a unique fingerprint.

    Cite this