Synthesis, Crystal structure and Transistor Performance of Tetracene Derivatives

The substitution of chloro or bromo groups in tetracene gives rise to the change of crystal structure, having a substantial effect on carrier transport. Halogenated tetracene derivatives were synthesized and grown into single crystals. Mono-substituted 5 bromo- and 5 chloro- tetracenes have the herringbone-type structure while 5,11 dichlorotetracene has the slipped π stacking structure. Mobility of 5,11 dichlorotetracene was measured to be as high as 1.6 cm 2 /Vs in single crystal transistors. The π stacking structure, which enhances π orbital overlap and facilitates carrier transport, may thus be responsible for this high mobility.