Mobility Enhancement in Conjugated Polymer Field-Effect Transistors Through Chain Alignment in a Liquid- Crystalline Phase
摘要：
A method is demonstrated by which liquid-crystalline self-organization in rigid-rod nematic conjugated polymers can be used to control the microstructure of the active semiconducting layer in solution-processed polymer thin-film transistors (TFTs). Enhanced charge carrier mobilities of0.01–0.02cm2/Vsand good operating stability have been achieved in polyfluorene copolymer TFTs by preparing the polymer in a nematic glassy state and by aligning the polymer chains parallel to the transport direction with the help of an alignment layer. Mobility anisotropies of 5–8 for current flow parallel and perpendicular to the alignment direction have been observed that are of the same order of magnitude as optical dichroic ratios.
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关键词：
Practical, Experimental/ carrier mobility conducting polymers liquid crystal polymers molecular electronics molecular orientation nematic liquid crystals organic semiconductors polymer blends thin film transistors/ conjugated polymer field-effect transistors mobility enhancement polymer chain alignment liquid-crystalline self-organization rigid-rod nematic conjugated polymers microstructure control active semiconducting layer solution-processed polymer thin-film transistors charge carrier mobilities operating stability polyfluorene copolymer TFTs nematic glassy state transport direction alignment layer mobility anisotropy optical dichroic ratios/ B2230 Molecular electronics B2560R Insulated gate field effect transistors B4150D Liquid crystal devices
DOI：
10.1063/1.126991
被引量：
年份：
2000
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