Abstract
High-transparency soluble polyimide with COOH and fluorine functional groups and TiO2-SiO2 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 cm2·V−1·s−1 at an inorganic content of 30 wt.%, and the switching current ratio was 9.04 × 103. After Jeffamine D2000 and polyurethane additives were added, the mobility and switching current could be increased to 0.817 cm2·V−1·s−1 and 4.27 × 105 for Jeffamine D2000 and 0.562 cm2·V−1·s−1 and 2.04 × 105 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.
Highlights
Stretchable electronic components have attracted much research interest due to their considerable potential in biomedical instruments, smart skins, displays, and battery devices [1,2,3]
The addition ratio of TiO2 -SiO2 inorganic nanoparticles ranges from 0 wt.% to 40 wt.%; the cases with those ratio values are denoted by A0–A40, B0–B40, and C0–C40, respectively, indicate the addition of Jeffamine D2000 and polyurethane additives in the order of 0 wt.% to 40 wt.%
These results prove that devices with Jeffamine D2000 (B0, B30) and polyurethane (C0, C30) as additives can be stretched to 20% and 50%, respectively
Summary
Stretchable electronic components have attracted much research interest due to their considerable potential in biomedical instruments, smart skins, displays, and battery devices [1,2,3]. Because the performance of an organic thin film transistor (OTFT) [5,6] has not been able to reach the same performance of inorganic transistor, researchers have continued to study the use of various semiconductor materials [7,8,9,10,11] to improve their carrier mobility. Polymers 2020, 12, 1058 the phase separation that can usually be observed in traditional materials These hybrid materials have the advantages of organic and inorganic materials, providing excellent material properties, including thermal, mechanical, optical, and electrical properties. The use of inorganic composite material TiO2 -SiO2 has been featured in the literature [28,29] Such an organic-inorganic hybrid film [30] was applied in OTFT as a dielectric film. Structure with illustration of each strain in direction in an organic thin film transistor
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