We have found a novel organic semiconductor, BTQBT, with a high electrical conductivity of about 10^{-3} S cm^{-1} and a high Hall mobility of about 3 cm^{2} V^{-1}s^{-1} at room temperature. We have also succeeded in measuring the temperature dependence of the Hall mobility. It varies with temperature as Τ^{-1.6}, which agrees with the theoretical Τ^{-1.5} dependence for the mobility determined by lattice scattering. The characteristic transport property of BTQBT results from strong intermolecular interactions in the crystal, which is convinced by the energy dispersion with a bandwidth of about 0.5 eV from the theoretical and experimental band structures.
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