Photocrosslinkable zinc diacrylate-based gate insulators for reliable operation of organic thin film transistors

Abstract

We report new organic-inorganic hybrid gate insulator materials containing solution-processable zinc diacrylate (ZnDA) and dipentaerythritol penta-/hexa-acrylate (DPHA) to fabricate high-performance and reliable organic thin film transistors (OTFTs). ZnDA-DPHA organic-inorganic hybrid materials can be crosslinked by ultraviolet illumination (λmax = 365 nm) within 7 min in the presence of a photoinitiator. Hence, the crosslinked insulator film provides not only good insulating properties (such as a dielectric constant of ca. 4.95 and low leakage current of <2 × 10−7 A/cm2 at 2 MV/cm) but also surface properties that can induce good semiconductor growth. Consequently, pentacene-based OTFTs employing the crosslinked ZnDA-DPHA gate insulators showed good electrical performance and reliable device operation. © 2018