American Institute of Physics, Applied Physics Letters, 17(87), p. 172110
DOI: 10.1063/1.2117632
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By photochemically cross linking the molecules of a reactive end group functionalized calamitic liquid crystal (bis(heptylphenyl)-bithiophene-oxetane) in the smectic mesophase, an insoluble rigid molecular network is formed which remains structurally unchanged on cooling to room temperature. The charge transport is investigated by the time-of-flight method and the resulting material shows long-range (∼10 μ m ) ambipolar transport with nondispersive field independent hole mobility, μ hole =0.016 cm 2/ V s and dispersive field dependent electron mobility, typically μ electron =0.028 cm 2/ V s (both at 4×104 V cm -1 and at 15 °C). These desirable charge transport properties make this system a promising candidate for organic electronic applications, such as charge transport layers in organic light-emitting diodes and field effect transistors.