Blend thin films, prepared by dip-coating, of polyfluorene (F8 or PFO), acting as an electron donor, and [6,6]-phenyl-C61- butyric acid methyl ester (PC60BM), acting as the electron acceptor, have been characterized by UV/VIS absorption spectroscopy, static and dynamic fluorescence, and atomic force microscopy. Four different solvents were used for the film preparation; the monohalogenated fluorobenzene and chlorobenzene and their dihalogenated counterparts odifluorobenzene and o-dichlorobenzene, respectively. Fluid mechanics calculations were used to determine the withdrawal speed for each solvent, in order to prepare wet films of comparable thicknesses. The resulting dry films were also of similar thicknesses. It was found that the choice of solvent influences the ability for F8 to form its β-phase.
Jan van Stam, Leif Ericsson, Dargie Deribew, and Ellen Moons, "Morphology in dip-coated blend films for photovoltaics studied by UV/VIS absorption and fluorescence spectroscopy," Proc. SPIE 10687, Organic Electronics and Photonics: Fundamentals and Devices, 106870A (Presented at SPIE Photonics Europe: April 25, 2018; Published: 21 May 2018); https://doi.org/10.1117/12.2306857.
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