Importance of C-2 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 C-2-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 of > 0.1 cm(2)/(V s) feature a repeat unit with C-2 symmetry; however, exceptions have been found from some push pull polymer structures.

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