Charge transport in mesomorphic derivatives of perylene

Charge carrier mobilities have been measured in the solid and liquid crysta lline phases of peripherally alkyl-chain substituted perylene derivatives u sing the pulse-radiolysis time-resolved microwave conductivity technique, P R-TRMC. By varying the alkyl substituents, the structure of the materials c an be changed from a two-dimensional layered arrangement of the perylene un its to one-dimensional, hexagonally packed columnar stacks.. In all cases t he pseudo-isotropic mobility within organised domains, Sigma mu(TRMC) is fo und to lie within the range 0.01 to 0.1 cm(2)/V/s and is only slightly depe ndent on temperature. In contrast to other discotic materials previously st udied, no pronounced sharp decrease in Sigma mu(TRMC) is found at the cryst alline solid to liquid crystal phase transition.