| 초록 |
To date, poly(4-vinylphenol) (PVP) (especially in the cross-linked form) is the most promising gate dielectric materials in organic electrics in the sense of realizing complex circuits on rigid and flexible substrates. However, crosslinked PVP using poly(melamine-co-formaldehyde) methylated as a cross-linking agent was known forming a “Bakelite” structure. This means that the hydroxyl group of PVP still remains after crosslinking reaction. Such hydroxyl groups can absorb moisture and could be an origin of severe hysteresis in TFT operation. Here, we modified PVP structure with thermally curable 4-trifluorovinyl moiety. Thin film properties of novel thermally crosslinked PVP (TFVOB-PVP) were systematically investigated such as chemical structures, surface roughness, surface energy, and capacitance, etc. Pentacene thin film transistor with TFVOB-PVP as a gate insulator showed a field effect mobility as 0.14 cm2/Vs with almost no hysteresis behavior. |
