based on epitaxially grown crystals of a thiophene/phenylene co-oligomer are described. The field-effect transistors exhibit good operation characteristics, and the epitaxial needle-like crystals display good charge transport properties along the needle axis. The maximum hole mobility of 0.66 cm² V^–1 s^–1 is close to that of vapor phase grown oligothiophene single crystals. (M. Ichikawa, T. Taniguchi et al., September 16, Adv. Mater. 2002, 14, 1272-1275)