A “Kite” Shaped Styryl End-Capped Benzo[2,1-b:3,4-b′]dithiophene with High Electrical Performances in Organic Thin Film Transistors

The bridging of distyryl-bithiophene leads to a kite shape of the conjugated system. This twist is not like twistacenes or twist deformation in α-oligothiophenes but a curvature such as in bowl shaped systems. Initially perceived to be undesirable, this new semiconductor in OTFT devices provides excellent performances in air, μ = 0.1 cm2/V.s, Ion/Ioff > 106, S < 4 V/decade, higher by a factor of 5 to the parent unbridged coplanar analogue.