Amorphous Fluorinated Acrylate Polymer Dielectrics for Flexible Transistors and Logic Gates with High Operational Stability

Abstract

Fluorinated amorphous polymeric gate-insulating materialsfor organicthin-film transistors (OTFTs) not only form hydrophobic surfaces butalso significantly reduce traps at the interface between the organicsemiconductor and gate insulator. Therefore, these polymeric materialscan enhance the OTFT's operation stability. In this study,we synthesized a new polymeric insulating material series composedof acrylate and fluorinated functional groups (with different ratios)named MBHCa-F and used them as gate insulators for OTFTs and in otherapplications. The insulating features of the MBHCa-F polymers, includingsurface energy, surface atomic content properties, dielectric constant,and leakage current, were clearly analyzed with respect to the contentof the fluorinated functional groups. At higher fluorine-based functionalgroup content, the polymeric series exhibited higher fluorine-basedcontents at the surface and superior electrical properties, such asfield-effect mobility and driving stability, at OTFTs. Therefore,we believe that this study provides a substantial method for synthesizingpolymeric insulating materials to enhance the operational stabilityand electrical performance of OTFTs.