| 초록 |
Currently, energy level control is emerged as one of the valuable strategies for tailoring properties of organic semiconductors. In this study, we explored the proper method to tune the energy level with replacing electron-rich thiophene unit with electon-deficient thiazole unit. The presence of electronegative nitrogen atoms in thiazole bring lowered highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of π-conjugated polymer system. The four polymers were synthesized by using dithienyldiketopyrrolopyrrole (DPP) or dithiazolyldiketopyrrolopyrrole (TzDPP) monomers coupled with bithiophene (BT) or bithiazole (BTz) monomers. Charge-carrier transport properties of the four polymers were studied using organic thin film transistors with top-contact/bottom-gate device configurations. Among the polymers, P(TzDPP-BTz) only demonstrated n-type semiconducting characteristics without passivation process under ambient condition. |
