| 초록 |
There has been extensive work on the directied self-assembly of block copolymer (BCP) thin films, forming both periodic and aperiodic arrays of microdomains which have applications in diverse fields including lithography, nanofabrication, filtration, or photonics. Here, we demonstrate that confinement of a cylindrical-morphology BCP in templates with various shapes. First, a spiral morphology is promoted by the presence of a notch-shaped feature within the template which controls the spiral chirality. We also investigate self-assembly of block copolymers inside square or rectangle templates with dimensions of a few L0. In square confinement, two degenerate orientations of the ladder-shaped structures are formed. We control the orientation of binary states by either creating openings around the square, or changing the confinement aspect ratio. |
