Patent ID: 9691614
Date: 2017-06-27
CPC Classifications: G03F,H01L

Claim:
1. A method of forming patterns, the method comprising: forming an array of pillars and a template portion to provide first openings on an underlying layer; forming a separation wall layer including separation wall portions that cover sidewalls of the pillars and sidewalls of the first openings; forming a block copolymer layer on the separation wall layer; forming first domains in gaps between the pillars, forming second domains surrounding and separating the first domains, forming third domains in the first openings, and forming fourth domains surrounding the third domains, by annealing the block copolymer layer; forming second openings in the gaps between the pillars, and forming third openings in the first openings, by selectively removing the first domains and the third domains; forming fourth openings by selectively removing the pillars; and forming fifth openings that penetrate the underlying layer and extend from the second and fourth openings, and forming sixth openings that penetrate the underlying layer and extend from the third openings.