Computational studies of shape rectification in directed self-assembly

摘要

We use self-consistent field theory (SCFT) to study shape rectification in overlapped cylindrical and non-cylindrical prepatterns. Specifically, we examine the potential of directed self-assembly (DSA) of block copolymers to not only reduce critical dimensions relative to the template, but also repair defects in the guiding prepatterns and produce defect-free contact holes. In our study over a wide range of prepattern dimensions, we found that defects in the central minor-block domain arise with decreasing center-to-center distance of the prepattern. Increasing the minor-block fraction in the block copolymer was observed to remove some of the defects. We also studied the effect of adding homopolymer to the block copolymer melt and show how blends can successfully eliminate defects and increase the range of the process window relative to the neat diblock case without influencing domain properties such as the critical dimension and the hole-to-hole distance.