Fullerene mixtures enhance the thermal stability of a non-crystalline polymer solar cell blend.

Camilla Lindqvist, Jonas Bergqvist, Olof Backe, Stefan Gustafsson, Ergang Wang, Eva Olsson, Olle Inganas, Mats R. Andersson, Christian Muller

    Research output: Contribution to journalArticlepeer-review

    44 Citations (Scopus)


    Printing of polymer:fullerene solar cells at high speed requires annealing at temperatures up to 140°C. However, bulk-heterojunction blends that comprise a non-crystalline donor polymer often suffer from insufficient thermal stability and hence rapidly coarsen upon annealing above the glass transition temperature of the blend. In addition, micrometer-sized fullerene crystals grow, which are detrimental for the solar cell performance. In this manuscript, we present a strategy to limit fullerene crystallization, which is based on the use of fullerene mixtures of the two most common derivatives, PC61BM and PC71BM, as the acceptor material. Blends of this fullerene mixture and a non-crystalline thiophene-quinoxaline copolymer display considerably enhanced thermal stability and largely retain their photovoltaic performance upon annealing at elevated temperatures as high as 170?°C.

    Original languageEnglish
    Article number153301
    Pages (from-to)Art: 153301
    Number of pages5
    JournalApplied Physics Letters
    Issue number15
    Publication statusPublished - 14 Apr 2014


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