| 초록 |
Recently, naphthalene diimide (NDI)-based copolymers have attracted great interest as solution-processable high-performance n-channel semiconductors due to their strong electron-withdrawing characteristics. Herein, we report on the structure-property relationship study of organic field-effect transistors (OFETs) based on NDI-based donor (D)-acceptor (A) copolymers containing various donor groups: acene- (benzene (Bz), naphthalene (Np), and pyrene (Py)) and heteroacene-type components (selenophene (Se) and thiophene (Th)). An acene-based centrosymmetric copolymer, PNDI-Np, has been found to show the best OFET performance compared to the other copolymers with axisymmetric units, regardless of strength of the electron-rich donor moieties inserted to lower the band gap and further strengthen efficient intramolecular charge transfer (ICT). We have investigated the influence of the geometric features and electron-donating capability of the donors in the backbone on the OFET performance. |
