The influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells

M. M. Koetse, J. Sweelssen, T. Franse, S. C. Veenstra, J. M. Kroon, X. Yang, A. Alexeev, J. Loos, U. S. Schubert, H. F.M. Schoo

    Research output: Contribution to journalConference articlepeer-review

    9 Citations (Scopus)

    Abstract

    Polymer bulk hetero junction solar cells were made from poly(2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylene-vinylene) (MDMO-PPV) as donor and poly(cyanoetherphenylenevinylene) (PCNEPV) derivatives as acceptor material. In this paper we start out with discussing the synthesis of the materials. Subsequently, the main issues concerning the devices are treated. Annealing the devices yielded devices with encouraging efficiencies of 0.5% (1 sun, 100mW/cm2), as calculated from the maximum power points (MPP). AFM studies revealed that this anneal step improves especially the interface of the active layer with the under laying PEDOT:PSS, although mobility and morphology changes can not be ruled out. Lowering the molecular weight (Mw) of the MDMO-PPV gave a slight improvement of the device performance. Decreasing the Mw of the acceptor material, MDMO-PCNEPV (PCNEPV derivative with the same side chains as MDMO-PPV) and optimizing the layer thickness led to a device with an efficiency of 0.65%. Finally we looked into the influence of the nature of the side chains on the acceptor polymer. The results suggest that the closer the resemblance between donor and acceptor is the better the device performance.

    Original languageEnglish
    Pages (from-to)119-128
    Number of pages10
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume5215
    DOIs
    Publication statusPublished - 2004
    EventOrganic Photovoltaics IV - San Diego, CA, United States
    Duration: Aug 7 2003Aug 8 2003

    Keywords

    • AFM
    • Organic photovoltaics
    • Polymer solar cell
    • Semiconducting polymers
    • Synthesis
    • TEM

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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