Yu Yang-Yen, Yang Cheng-Huai
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan.
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan City 33302, Taiwan.
Polymers (Basel). 2020 May 5;12(5):1058. doi: 10.3390/polym12051058.
High-transparency soluble polyimide with COOH and fluorine functional groups and TiO-SiO composite inorganic nanoparticles with high dielectric constants were synthesized in this study. The polyimide and inorganic composite nanoparticles were further applied in the preparation of organic-inorganic hybrid high dielectric materials as the gate dielectric for a stretchable transistor. The optimal ratio of organic and inorganic components in the hybrid films was investigated. In addition, Jeffamine D2000 and polyurethane were added to the gate dielectric to improve the tensile properties of the organic thin film transistor (OTFT) device. PffBT4T-2OD was used as the semiconductor layer material and indium gallium liquid alloy as the upper electrode. Electrical property analysis demonstrated that the mobility could reach 0.242 cm·V·s at an inorganic content of 30 wt.%, and the switching current ratio was 9.04 × 10. After Jeffamine D2000 and polyurethane additives were added, the mobility and switching current could be increased to 0.817 cm·V·s and 4.27 × 10 for Jeffamine D2000 and 0.562 cm·V·s and 2.04 × 10 for polyurethane, respectively. Additives also improved the respective mechanical properties. The stretching test indicated that the addition of polyurethane allowed the OTFT device to be stretched to 50%, and the electrical properties could be maintained after stretching 150 cycles.
本研究合成了具有COOH和氟官能团的高透明度可溶性聚酰亚胺以及具有高介电常数的TiO-SiO复合无机纳米颗粒。聚酰亚胺和无机复合纳米颗粒进一步应用于制备有机-无机杂化高介电材料，作为可拉伸晶体管的栅极电介质。研究了杂化薄膜中有机和无机组分的最佳比例。此外，将Jeffamine D2000和聚氨酯添加到栅极电介质中，以改善有机薄膜晶体管（OTFT）器件的拉伸性能。使用PffBT4T-2OD作为半导体层材料，铟镓液态合金作为上电极。电学性能分析表明，在无机含量为30 wt.%时，迁移率可达0.242 cm²·V⁻¹·s⁻¹，开关电流比为9.04×10³。添加Jeffamine D2000和聚氨酯添加剂后，Jeffamine D2000的迁移率和开关电流可分别提高到0.817 cm²·V⁻¹·s⁻¹和4.27×10⁴，聚氨酯的迁移率和开关电流可分别提高到0.562 cm²·V⁻¹·s⁻¹和2.04×10⁴。添加剂还改善了各自的机械性能。拉伸测试表明，添加聚氨酯后OTFT器件可拉伸至50%，拉伸150次循环后电学性能仍可保持。
