Pad printing as a film forming technique for polymer solar cells

Frederik C Krebs

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Pad printing as a technique for preparing the active layer in polymer solar cells is presented. The technique employs a silicone rubber stamp to pick up the motif from a gravure plate and transfer it to the substrate. The strengths and limitations of pad printing are discussed and polymer solar cells prepared by pad printing are presented. Devices were prepared on indium tin oxide substrates but in principle the entire photovoltaic device comprising front and back electrodes, barrier layers and active layer could be printed with no need for vacuum steps. The device geometry comprises a spin coated transparent zinc oxide front electrode, a pad printed active layer based on a bulk heterojunction of the thermocleavable polymer poly(3-(2-methylhexyloxycarbonyl)thiophene-co-thiopene) (P3MHOCT) and zinc oxide nanoparticles, spin coated PEDOT:PSS and finally a manually cast thermally cured silver paste back electrode. The P3MHOCT was converted to poly(3-carboxy-dithiophene) (P3CT) in situ by heating the film to 200 deg. C for a brief period. The entire printing and device preparation was carried out in the ambient atmosphere and the devices obtained had a good stability in air during storage and operation.
    Original languageEnglish
    JournalSolar Energy Materials & Solar Cells
    Volume93
    Issue number4
    Pages (from-to)484-490
    ISSN0927-0248
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    This work was further supported by the Danish Strategic
    Research Council (DSF 2104-05-0052 and DSF-2104-07-0022).

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