Patent ID: 9530663
Filing Date: 2016-12-27
CPC Classification: B05D,H01L

Claim Text:
1. A method for forming a pattern, comprising: forming an array of circular pillars on a substrate, wherein the circular pillars are arranged in a staggered manner; conformally forming a spacer layer on the circular pillars and the substrate to form a plurality of first concave portions surrounded by the spacer layer; etching the spacer layer to form an annular spacer surrounding each of the circular pillars and expose the circular pillars; removing the circular pillars to form a plurality of second concave portions surrounded by the annular spacer; filling up the first concave portions and the second concave portions with a directed self-assembly material; and activating a directed self-assembly process so that the directed self-assembly material filling up the first concave portions and the second concave portions diffuse to the boundaries of the first concave portions and the second concave portions to form a hole surrounding by the directed self-assembly material in each of the first concave portions and the second concave portions.