Thieno[3,2-]pyrrole and Benzo[][1,2,5]thiadiazole Donor-Acceptor Semiconductors for Organic Field-Effect Transistors.

Two p-type donor-acceptor (D-A) semiconducting small molecules were synthesized to investigate the effect of the backbone curvature on the organic field-effect transistor performance. The backbone curvature of the donor-acceptor small molecules was modified by changing the spacer group from bithiophene to thienothiophene. Bithiophene to thienothiophene spacer groups were placed between 4-thieno[3,2-]pyrrole (donor) and benzo[][1,2,5]thiadiazole (acceptor) to generate and donor-acceptor molecules.