| 초록 |
High dielectric constant materials have been extensively investigated for many potential applications including low-voltage-operating organic field-effect transistors (OFETs). In this study, we overcoated fluorinated polymer onto barium titanate (BaTiO3) dielectrics toward the fabrication of highly stable OFETs. Surface of BaTiO3 dielectric layers were effectively modified with poly(pentafluorostyrene) (PFS) overcoating. The PFS/BaTiO3 bilayer dielectrics significantly controlled leakage currents and surface properties. Featureless surface morphologies of their films induced better crystalline structures of overlying semiconductor molecules. Moreover, the electron-withdrawing character of PFS/BaTiO3 films effectively blocked hole trapping. Finally, the overcoating of PFS allowed PFS/BaTiO3 to be utilized as gate dielectric layer for highly stable OFETs during low-voltage operation. |
