Park Jaehoon, Bae Jin-Hyuk, Kim Won-Ho, Lee Sin-Doo, Park Bong June, Choi Hyoung Jin, Kim Dong Wook, Choi Jong Sun
Department of Electrical, Information and Control Engineering, Hongik University, Seoul 121-791, Korea.
J Nanosci Nanotechnol. 2011 May;11(5):4466-70. doi: 10.1166/jnn.2011.3695.
Organic-inorganic composites can provide a unique feature combining superior dielectric properties of inorganic materials and solution processing capability of organic materials. In this study, poly(4-vinylphenol) (PVP) and titanium dioxide (TiO2) composite was prepared by mixing TiO2 nanoparticles in the PVP solution. In order to avoid severe gate-leakage currents in organic thin-film transistors (OTFTs) with such a composite gate dielectric layer, poly(oxyethylene)(20)-sorbitane monooleate was used as a surfactant for uniform dispersion of TiO2 particles. The dispersion stability of TiO2 nanoparticles in the composite solutions was confirmed by observing its sedimentation time in the composite solutions. The composite dielectric film, fabricated by means of simple spin-coating, provided an enhanced dielectric property and contributed to reducing the threshold voltage of OTFT, without augmenting the gate-leakage current. These results demonstrate that the fabricated composite dielectric film is essentially eligible for low-voltage operating OTFTs.
有机-无机复合材料能够提供一种独特的特性，即结合了无机材料卓越的介电性能和有机材料的溶液加工能力。在本研究中，通过将二氧化钛（TiO₂）纳米颗粒混入聚乙烯基苯酚（PVP）溶液中来制备聚（4-乙烯基苯酚）（PVP）与二氧化钛（TiO₂）的复合材料。为了避免在具有这种复合栅极介电层的有机薄膜晶体管（OTFT）中出现严重的栅极漏电流，使用聚氧乙烯（20）-脱水山梨醇单油酸酯作为表面活性剂，以使TiO₂颗粒均匀分散。通过观察TiO₂纳米颗粒在复合溶液中的沉降时间，证实了其在复合溶液中的分散稳定性。通过简单的旋涂法制备的复合介电膜具有增强的介电性能，有助于降低OTFT的阈值电压，而不会增加栅极漏电流。这些结果表明，所制备的复合介电膜本质上适用于低压工作的OTFT。
