Fabrication of planarly-oriented polycrystalline thin films of organic semiconductors was investigated, in which molecules sit parallel, i.e., “face-on” on the substrate so as to allow vertical charge transport favorably through a thin film. With the aid of self-organization of liquid crystalline molecules and an over-coated orientation layer, tens of nm thin films vertically oriented can be re-oriented from “hemeotropic, or vertical” to “homogenous or planar” to achieve polycrystalline thin films planarly oriented after removing the over-coated orientation layer. We investigated the key factors to affect re-orientation of the films and uniformity and surface morphology of the resulting films, including conditions required for the re-orientation and properties of the orientation layer materials and liquid crystals.

中文翻译：

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近晶液晶有机半导体的平面取向多晶薄膜的制备

研究了有机半导体的平面取向多晶薄膜的制备，其中分子平行排列，即在衬底上“面对面”，以便允许垂直电荷顺利通过薄膜传输。借助于液晶分子的自组织和覆盖的取向层，可以将垂直取向的数十nm薄膜从“同相或垂直”重新取向为“均匀或平面”，从而在平面上获得多晶薄膜去除覆盖涂层的定向层后进行定向。我们研究了影响薄膜重新取向以及所得薄膜的均匀性和表面形态的关键因素，包括重新取向所需的条件以及取向层材料和液晶的性能。