Equilibration and reversibility in polymer/fullerene nanocomposites
Organic photovoltaics (OPVs) 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 lifetime and robustness of performance. Polymer/fullerene blends are bench-mark OPVs. 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. This proposal forms part of a wider effort in which our motivation is to reduce complexity and complement device optimisation strategies with an in-depth study of structure and kinetics in polymer/fullerene systems aimed at increasing the fundamental understanding of the materials science within polymer nanocomposite thin-films. This proposal focusses on a model polymer/fullerene system, in a bilayer geometry, in which neither component crystallises. We propose to characterise bis-PCBM/polystyrene at elevated temperatures, and robustly probe the behaviour of what we hypothesise is a liquid-liquid equilibrium system, as a function of annealing temperature, MW and starting point (composition profile before annealing).
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HIGGINS Anthony M.; CABRAL Joao T.; GUTFREUND Philipp; HYNES Elizabeth; ITALIA Valeria and SYROMYATNIKOV Vladislav. (2019). Equilibration and reversibility in polymer/fullerene nanocomposites. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1903
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