高度取向的半导体聚合物薄膜的溶液浸涂法生长及其电荷传输特性研究

发布时间：2018-06-19 02:02

  本文选题：半导体聚合物 + 分子取向　； 参考：《物理学报》2017年15期

【摘要】：有效地控制有机半导体分子取向和堆积特性对实现高性能电子器件具有非常重要的意义,而发展简便高效的溶液相成膜技术是实现这一目的的重要途径.本文采用改进的溶液浸涂法,成功地成长出大面积宏观取向的半导体聚合物P(NDI2OD-T2)和PTHBDTP薄膜.偏光显微镜和极化的紫外-可见光吸收谱测量显示,薄膜中聚合物分子主链骨架沿成膜时液面下移方向择优取向.原子力显微镜观察到聚合物薄膜由纳米尺度的取向有序晶畴构成,畴的取向与分子链的取向一致.采用衬底-溶液界面处表面张力和溶剂蒸发诱导的分子自组织过程来解释浸涂法生长聚合物取向薄膜的微观机理.使用取向的P(NDI2OD-T2)薄膜制备场效应晶体管,显著地提高了电子迁移率(可达4倍),并实现高达19的迁移率各向异性度.这可归因于共轭的聚合物主链骨架择优取向引起电荷传导通路的变化.
[Abstract]:The effective control of the molecular orientation and accumulation characteristics of organic semiconductors is of great importance to the realization of high performance electronic devices. The development of simple and efficient solution film forming technology is an important way to achieve this purpose. In this paper, an improved solution immersion method has been adopted to successfully develop a large area macro oriented semiconductor polymer P (NDI 2OD-T2) and PTHBDTP thin films. Polarizing microscope and polarimetric UV visible absorption spectra show that the main chain skeleton of the polymer molecules in the film moves down the orientation of the liquid surface. The atomic force microscope observed that the polymer films are constructed from the ordered ordered domain of the nanoscale, and the orientation of the domain is in accordance with the orientation of the molecular chain. The surface tension at the substrate solution interface and the molecular self-organizing process induced by solvent evaporation explain the micromechanism of the polymer oriented thin films grown by the dip coating method. The field effect transistors are prepared by using the orientation P (NDI2OD-T2) film, which significantly improves the electron mobility (up to 4 times) and achieves a high mobility of 19 of the anisotropy of the migration rate. The charge transduction pathway changes due to the preferred orientation of conjugated polymer backbone chains.
【作者单位】： 中国科学院强磁场科学中心;中国科学技术大学;
【基金】：国家自然科学基金(批准号:11574314,U1532156) 中国科学院“百人计划”资助的课题~~
【分类号】：TN304
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本文编号：2037847