Patent ID: 9159558
Filing Date: 2015-10-13
Classification: B05D,B81C,G03F,H01L

Abstract:
1. A method of reducing the number of defects in a directed self-assembled structure formed on a guiding pre-pattern on a substrate, the method comprising: (a) applying a first layer comprising a first self-assembly material onto the guiding pre-pattern, the first self-assembly material forming domains whose alignment and orientation are directed by the guiding pre-pattern, thereby creating a first self-assembled structure; (b) optionally annealing the first self-assembled structure; (c) directly following step (b), or if step (b) is not performed then directly following step (a): washing away the first self-assembled structure, without removing the guiding pre-pattern; and (d) after said washing, applying a second layer comprising a second self-assembly material over the substrate, wherein the second layer occupies space previously occupied by the first layer, the second self-assembly material forming a second self-assembled structure having fewer defects than the first self-assembled structure.