Hydroxyl-rich siloxane hybrid dielectric with moisture-enhanced dipolar polarization and hydrophobic surface passivation for stable low-voltage OTFTs

초록

We report the design of a siloxane-based organic-inorganic hybrid dielectric system that simultaneously achieves high permittivity, interfacial stability, and controlled moisture interaction, essential for reliable low-voltage organic thin film transistors (OTFTs). The hybrid films were synthesized via controlled sol-gel processing of amphiphilic urethane precursors, alkoxysilanes, and fluorinated siloxane modifiers, yielding homogeneous structures with tunable thickness and suppressed phase separation. Polar functionalities embedded in the bulk enhance dipolar polarization and dielectric constant (higher than 5), while fluorinated surface layers effectively suppress moisture-induced interfacial trapping at the dielectric/organic semiconductor interface. The integrated hybrid architecture enables stable operation of OTFTs under low bias, demonstrating the potential of this approach for robust and scalable flexible electronic devices.

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