Vertical phase separation of 6,13-bis(triisopropylsilylethynyl) pentacene/poly(methyl methacrylate) blends prepared by electrostatic spray deposition for organic field-effect transistors
Vertical phase separation of 6,13-bis(triisopropylsilylethynyl) pentacene/poly(methyl methacrylate) blends prepared by electrostatic spray deposition for organic field-effect transistors
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DOI：
10.7567/jjap.56.05eb03
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发表时间：
2017-03
影响因子：
1.5
通讯作者：
N. Onojima;K. Hara;A. Nakamura
中科院分区：
文献类型：
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作者：
N. Onojima;K. Hara;A. Nakamura
通过静电喷涂沉积（ESD）制备了由 6,13-双（三异丙基甲硅烷基乙炔基）并五苯（TIPS 并五苯）和聚甲基丙烯酸甲酯（PMMA）组成的共混膜。 ESD 被认为是干法和湿法工艺之间的中间工艺，因为小液滴中存在的溶剂在到达基板之前几乎可以蒸发。可以省略耗时的残留溶剂蒸发的后干燥处理。然而，由于共混膜的垂直相分离与溶剂蒸发有关，因此尚不清楚在ESD过程中能否形成垂直相分离结构。在这项研究中，我们基于 ESD 制备的共混薄膜制造了底栅、顶接触有机场效应晶体管，并且该器件表现出具有小磁滞的晶体管行为。这一结果表明，混合膜（上部 TIPS 并五苯活性层/底部 PMMA 栅极绝缘体）的垂直相分离可以在简便的一步 ESD 工艺中发生。
Blend films composed of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) and poly(methyl methacrylate) (PMMA) were prepared by electrostatic spray deposition (ESD). ESD is considered as an intermediate process between dry and wet processes since the solvent present in small droplets can almost be evaporated before arriving at the substrate. Post-drying treatments with the time-consuming evaporation of residual solvents can be omitted. However, it is still not clear that a vertically phase-separated structure can be formed in the ESD process since the vertical phase separation of the blend films is associated with the solvent evaporation. In this study, we fabricated bottom-gate, top-contact organic field-effect transistors based on the blend films prepared by ESD and the devices exhibited transistor behavior with small hysteresis. This result demonstrates that the vertical phase separation of a blend film (upper TIPS pentacene active layer/bottom PMMA gate insulator) can occur in the facile one-step ESD process.