Dramatic enhancement of carrier mobility via effective secondary structural arrangement resulting from the substituents in a porphyrin transistor.

OFET devices based on single-crystals of two different porphyrin derivatives display excellent mobilities of 2.57 and 0.48 cm(2) V(-1) s(-1). Although they generate similar J-aggregations, the dramatic enhancement of mobility obtained using porphyrin 1 is due to the well-confined secondary structural arrangement caused by substituents on the porphyrin ring.

An unsymmetrically π-extended porphyrin-based single-crystal field-effect transistor and its anisotropic carrier-transport behavior.

Anisotropic charge transport: Single-crystal organic field-effect transistor devices derived from aggregates of thiophene-appended porphyrins display very high mobility (0.27 cm(2) V(-1) s(-1)). This behavior is due to staircase stacking of the porphyrins with distances between layers of 3.17(7) Å. Furthermore, the charge-transport behavior is anisotropic owing to an anisotropic molecular arrangement in the single-crystal microplates.