Thin-film transistors of halogen-substituted tetraphenylpentacenes are investigated. These compds. exhibit mainly hole transport, but the chlorine compd. shows considerably higher performance than the fluorine and bromine compds. In addn., the chlorine compd. shows ambipolar properties, though the hole mobility is four times larger than the electron mobility. These compds. have basically the same crystal structures, but the remarkable halogen dependence is explained by the crit. location of the LUMO levels, as well as intermol. transfers, which sensitively change depending on the stacking geometry. In particular, hole and electron transfer exhibit different periodicity depending on the slip distance along the mol. long axis, and this is related to the appearance of the electron transport properties. [on SciFinder(R)]
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