Uniaxially aligned polymer semiconductor nano-arrays with enhanced dichroic ratio
발표자
()
초록
내용
Polymer semiconductor thin films with optical anisotropy have recently attracted attention due to optical birefringence characteristics. Herein, we report a simple but cost-effective technique for developing uniaxially aligned polymer semiconductor arrays using disc-assisted capillary force lithography. Ultraviolet-cured polyurethane acrylate (PUA) molds were fabricated from various commercial discs including compact discs (CDs), digital video disc (DVDs), and Blu-ray discs (BDs). While nano-arrays prepared with CD and DVD-based PUA molds showed pitch widths of 1.0 and 0.7 μm, width of 1.0 and 0.5 μm, and height of 100 and 100 nm, respectively, Blu-ray-assisted nano-array was not formed properly due to their too narrow pitch width (320 nm). The CD-assisted nano-array showed the higher dichroic ratio (DR >2) than that of the DVD counterpart (DR >1.5). Our results provide an effective and cost-effective strategy for multi-scale unidirectional patterning of polymer semiconductors.