High Mobility Field Effect Transistors Based on Macroscopically Oriented Regioregular Copolymers

Field-effect transistors fabricated from semiconducting conjugated polymers are candidates for flexible and low-cost electronic applications. Here, we demonstrate that the mobility of high molecular weight (300 kDa) regioregular, poly4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b'dithiophen-2-yl)-alt-1,2,5thiadiazolo3,4-cpyridine] can be significantly improved by introducing long-range orientation of the polymer chains. By annealing for short periods, hole mobilities of 6.7 cm(2)/(V s) have been demonstrated. The transport is anisotropic, with a higher mobility (approximately 6:1) parallel to the polymer backbone than that perpendicular to the polymer backbone.