Preparation and Characterization of a Novel Polyimide/Surface Modified TiO<SUB>2</SUB> Nanocomposite for Solution Processable High k Dielectric
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초록
내용
For high performance organic thin film transistors (OTFTs), OTFT require dielectrics having a high dielectric constant and enhanced mechanical stability. We report on a novel polymer nanocomposite dielectric based on (3-aminopropyl)triethoxysilane (APTES) functionalized titanium dioxide (TiO2) nanoparticle as a dopant in crosslinkable polyimide (PI). Polyimide (DOCDA-6FHAB) was synthesized using the monomers, DOCDA and 6FHAB. And then, we introduced the TiO2 nanoparticle to make a high dielectric constant polyimide nanocomposite dielectric. Surface of TiO2 was modified APTES. Crosslinked DOCDA-6FHAB was capping layer. Polyimide nanocomposite bilayer film showed high dielectric constant (5.51) and low leakage current density (10-7A/cm2) in metal-insulator-metal (MIM) devices. Detailed synthetic routes of polyimide and nanocomposite film fabrication condition will be presented.