Bimodal crystallization at polymer-fullerene interfacesElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cp04253k

Bimodal crystallization at polymer-fullerene interfacesElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cp04253k

The growth-kinetics of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) crystals, on two different length-scales, is shown to be controlled by the thickness of the polymer layer within a PCBM-polymer bilayer. Using a model amorphous polymer we present evidence, from in situ optical microscopy and g...

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Hauptverfasser: Môn, Dyfrig, Higgins, Anthony M, James, David, Hampton, Mark, Macdonald, J. Emyr, Ward, Michael B, Gutfreund, Philipp, Lilliu, Samuele, Rawle, Jonathan
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creator Môn, Dyfrig
Higgins, Anthony M
James, David
Hampton, Mark
Macdonald, J. Emyr
Ward, Michael B
Gutfreund, Philipp
Lilliu, Samuele
Rawle, Jonathan
description The growth-kinetics of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) crystals, on two different length-scales, is shown to be controlled by the thickness of the polymer layer within a PCBM-polymer bilayer. Using a model amorphous polymer we present evidence, from in situ optical microscopy and grazing-incidence X-ray diffraction (GIXD), that an increased growth-rate of nanoscale crystals impedes the growth of micron-sized, needle-like PCBM crystals. A combination of neutron reflectivity and GIXD measurements, also allows us to observe the establishment of a liquid-liquid equilibrium composition-profile between the PCBM layer and a polymer-rich layer, before crystallization occurs. While the interfacial composition-profile is independent of polymer-film-thickness, the growth-rate of nanoscale PCBM crystals is significantly larger for thinner polymer films. A similar thickness-dependent behavior is observed for different molecular weights of entangled polymer. We suggest that the behavior may be related to enhanced local-polymer-chain-mobility in nanocomposite thin-films. The growth-kinetics of PCBM crystals, on two different length-scales, is controlled by the thickness of the polymer layer within a PCBM-polymer bilayer.
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title Bimodal crystallization at polymer-fullerene interfacesElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cp04253k
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