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<p>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 (&gt; 8), low leakage current densities (&lt; 10<sup>−8</sup> A&#xa0;cm<sup>−2</sup> at 2 MV&#xa0;cm<sup>−1</sup>), and minimal frequency dispersion, particularly in MGH3000. These characteristics enabled the fabrication of high-performance OTFTs with low operating voltages (≤ 5&#xa0;V), high field-effect mobility (up to 7.9 cm<sup>2</sup>&#xa0;V<sup>−1</sup>&#xa0;s<sup>−1</sup>), 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.</p> Graphical abstract <p>UV-crosslinkable high-k polyurethane acrylate dielectrics enable low-voltage OTFTs and integrated logic circuits with reliable performance and photopatternability</p>

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

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Rakhyeon Kim,
  • Mingyu Choi,
  • Yeongseo Gu,
  • Cheolmin Jung,
  • Chenhao Cong,
  • Ka Yeon Ryu,
  • Jihoon Lee,
  • Hoyoul Kong,
  • Se Hyun Kim

摘要

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 cm2 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.

Graphical abstract

UV-crosslinkable high-k polyurethane acrylate dielectrics enable low-voltage OTFTs and integrated logic circuits with reliable performance and photopatternability