Continuation Proposal-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 device-lifetime and robustness of performance. Polymer/fullerene mixtures can be fabricated into promising devices, but there is considerable sensitivity to material and processing parameters. This proposal forms part of a wider effort in which we seek to complement device optimisation strategies with an in-depth study of structure and kinetics, aimed at increasing the fundamental understanding of the materials science within fullerene/polymer films. We have discovered that model fullerene/amorphous-polymer bilayers undergo rapid mixing (long before the fullerene crystallises) to form a stable interface, with initial data suggesting broader interfaces for low molecular-weight (MW) polymer. This proposal will probe this interface as a function of the MW, temperature, annealing-time and starting thin-film composition-profile. The aim is to rigorously test the hypothesis that the film composition-profile results from the formation of a liquid-liquid equilibrium interface.
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HIGGINS Anthony M.; CABRAL Joao T.; GUTFREUND Philipp and HYNES Elizabeth. (2016). Continuation Proposal-Polymer/fullerene interfaces; Formation of a liquid-liquid equilibrium?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-456
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