Polymer/Fullerene interfaces; Formation of a liquid-liquid equilibrium?
Organic photovoltaics are candidates for the large-scale capture of solar radiation, due to the potential to process these materials in large areas at low cost. However, considerable challenges exist in terms of efficiency, lifetime and robustness of performance. Polymer/fullerene mixtures can be fabricated into promising devices. However, there is considerable variation in the efficiency of these complex devices as a result of the sensitivity to a host of material and processing parameters. Here, we focus on a model fullerene/amorphous-polymer bilayer. Even in this simplified system (in which only one component can crystallise and the morphology can be well-controlled/characterised) we have uncovered significant complexity in the formation of different forms of fullerene crystal, which is strongly influenced by the thickness of the polymer layer. However, we have discovered that we are also able to use this system to form an interface between amorphous-fullerene and the polymer. This experiment will probe this interface as a function of the polymer MW, and test the hypothesis that the composition profile represents 2 co-existing phases in a liquid-liquid equilibrium.
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HIGGINS Anthony M.; CABRAL Joao T.; GUTFREUND Philipp and HYNES Elizabeth. (2015). Polymer/Fullerene interfaces; Formation of a liquid-liquid equilibrium?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-387
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