Fabrication of planarly-oriented polycrystalline thin films of smectic liquid crystalline organic semiconductors

作者：Wang Yi Fei; Iino Hiroaki; Hanna Jun ichi^*

来源：Soft Matter, 2017, 13(37): 6499-6505.

DOI：10.1039/c7sm01303e

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.

• 出版日期2017-10-7