3B08 Fabrication of Parallel-aligned Polycrystalline Thin Films via Liquid Crystals

Abstract

A new method has been developed to fabricate a parallel-aligned polycrystalline thin film via liquid crystal. By using a top-coated film of water-soluble polymer, i.e., polyalcohol (PVA), the alignment of spin-coated liquid crystal thin film was successfully re-oriented from "perpendicular" to "parallel" orientation. Parallel-aligned Polycrystalline thin film as thin as 50nm could be easily processed while maintained good morphology. Our method will lead to a possible application of parallel-oriented organic semiconductor polycrystalline thin films, which can be hardly achieved with convention non-liquid crystalline organic semiconductor materials.