Importance of C2 symmetry for the device performance of a newly synthesized family of fused-ring thiophenes

摘要

We investigated the relationship between molecular structure and field-effect hole mobility in a family of fused-ring polythiophene copolymers that we designed recently. The results suggest that a repeat unit that possesses a C2 axis perpendicular to the conjugation plane is important to achieve a high-mobility. Our finding is supported by a review of literature data: Many polymer semiconductors showing a hole or electron mobility >0.1 cm²/V·s feature a repeat unit with C2 symmetry; however exceptions have been found from some push – pull polymer structures.