Abstract
Effect of multi-stacked layer (MSL), 0.1 mol (M) and 0.3 mol (M) hafnium oxide (<TEX>$HfO_2$</TEX>) alignment layers were fabricated via a solution-process for LCs orientation. The solutions were spin-coated and annealed in a furnace. MSL consists of three sub-layers using 0.1 M solution, mono-layer (ML) is composed of 0.3 M <TEX>$HfO_2$</TEX> solution. Then ion-beam irradiation was treated with 1.8 keV for 2 min. <TEX>$HfO_2$</TEX>-based LC cells were investigated through photographs, pre-tilt angle using crystal rotation method, X-ray photoelectron spectroscopy (XPS) measurement, and surface roughness using atomic force microscopy(AFM) for their characteristic research. Good LC orientation characteristics were observed on MSL <TEX>$HfO_2$</TEX> surface. The LC alignment mechanism on MSL <TEX>$HfO_2$</TEX> and ML <TEX>$HfO_2$</TEX> surfaces was attributed to van der Waals (VDW) interaction between the LC molecular and substrate surface.
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