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- W2079239009 abstract "We have used thermal treatment and rubbed polyimide alignment layers to produce large domains of poly(9,9-dioctylfluorene-co-bithiophene) alternating copolymer (F8T2). The direction of rubbing on the polyimide surface determines the orientation of these domains, allowing us to create thin-film transistors with channel lengths parallel and perpendicular to the liquid–crystal polymer director. We show that thermal annealing at 280 °C brings F8T2 into a mesophase as observed by X-ray diffraction and differential scanning calorimetry. Polarized optical microscopy and polarized UV–vis absorption spectroscopy show that this ordered phase is associated with very large ordered domains and corresponds to a thermotropic, nematic liquid–crystal phase. We investigated thermal annealing effects on both F8T2 structural ordering and the associated anisotropic electrical properties of the thin-film transistors (TFTs). Enhanced mobility of holes is observed with ordering. Field-effect mobility parallel to the polymer backbone is as much as 6.5 times greater than the perpendicular configuration." @default.
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- W2079239009 date "2004-10-01" @default.
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- W2079239009 title "Structural ordering and enhanced carrier mobility in organic polymer thin film transistors" @default.
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- W2079239009 doi "https://doi.org/10.1016/j.synthmet.2004.06.024" @default.
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