UV-curable high-k urethane acrylate polymer dielectrics for low-voltage thin-film transistors and logic circuits

초록

We report the synthesis and application of UV-curable polyurethane acrylate (PUA) dielectrics with high dielectric constant (high-k) properties for low-voltage organic thin-film transistors (OTFTs) and integrated logic circuits. Two PUA variants, MGH1000 and MGH3000, were synthesized by varying the molecular weight of the polyol precursors, enabling control over chain flexibility and dipolar polarization. Upon UV curing, both materials formed densely crosslinked networks with excellent mechanical and thermal stability. The dielectric films exhibited high k values (> 8), low leakage current densities (< 10(-8) A cm(-2) at 2 MV cm(-1)), and minimal frequency dispersion, particularly in MGH3000. These characteristics enabled the fabrication of high-performance OTFTs with low operating voltages (<= 5 V), high field-effect mobility (up to 7.9 cm(2) V-1 s(-1)), low subthreshold swing, and strong bias stress stability. Furthermore, photopatterned MGH dielectrics were integrated into functional NOT, NAND, and NOR logic gates, demonstrating reliable logic operation under low-voltage conditions. The combination of photo-patternability, high-k performance, and processing compatibility highlights the potential of these PUA dielectrics for next-generation organic electronics. [GRAPHICS]

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