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Ana Sofia Anselmo, Andrzej Dzwilewski, Krister Svensson and Ellen Moons Molecular orientation and composition at the surface of spin-coated polyfluorene:Fullerene blend films Journal of Polymer Science Part B: Polymer Physics 51

Version of Record online: 30 OCT 2012 | DOI: 10.1002/polb.23198

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Blended films of the polymer APFO-3 and the fullerene PCBM can be used in organic solar cells. NEXAFS spectroscopy was used to probe the outermost surface composition of films with different blend ratios, spin-coated from different solvents. All surfaces were found to be polymer enriched, with compositional variations occurring through the surface region of the films. Angle-resolved NEXAFS spectra revealed a predominantly plane-on orientation of the polymer's conjugated system in pure APFO-3 films, an effect that is attenuated in the blend films.

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