Field‐Effect Transistors Based on Oligothienylenevinylenes: From Solution π‐Dimers to High‐Mobility Organic Semiconductors

The substitution pattern of oligothienylenevinylenes (see Figure) exerts a determining effect on the packing arrangement of individual oligomers in the solid state, and thus on field‐effect mobility. These two parameters are tightly correlated to the propensity of the corresponding cation radical to dimerize in solution. The analysis of the π‐dimerization of conjugated cation radicals in solution could be used to screen new candidates for devices.