High performance organic field-effect transistors with wire bar-coated semiconducting polymer film

We fabricated high performance organic field-effect transistors (OFETs) with wire bar-coated semiconducting polymer film as an active layer. For an active layer of the OFETs, we employed cyclopentadithiophene–benzothiadiazole (CDT–BTZ) donor-acceptor (D-A) type copolymers consisting of CDT as an electron-donating unit and BTZ as an electron-accepting unit. The OFETs with bar-coated CDT-BTZ semiconducting copolymer films shows about five times higher field-effect mobility of 0.51cm2/Vs than 0.11 cm2/Vs of the OFETs with spin-coated CDT-BTZ film, although the charge carrier mobility of the D-A type semiconducting copolymer is less critical to the degree of alignment of the semiconducting polymer. Overall, the results demonstrate that the wire bar-coating process offer opportunities to enhance the performance of the OFETs.