Patent ID: 9659824
Date: 2017-05-23
CPC Classifications: G03F,H01L

Claim:
1. A method of forming semiconductor fins, said method comprising: forming a plurality of guiding pattern masks directly on a first portion of a topmost surface of an orientation control layer of a lithographic material stack, said lithographic material stack is located on a surface of a semiconductor substrate and said orientation control layer comprises a random copolymer; forming a self-assembled block copolymer structure between each neighboring pair of guiding pattern masks and directly on a second portion of said topmost surface of said orientation control layer of said lithographic material stack, said self-assembled block copolymer structure comprising a block copolymer having an array of first phase separated polymeric domains and an array of second phase separated polymeric domains, wherein each first phase separated domain and each second phase separated domain repeat in a regular manner filling an entire area between each neighboring pair of guiding pattern masks; selectively removing each guiding pattern mask without damaging said self-assembled block copolymer structure; selectively removing each first phase separated polymeric domain of said array of first phase separated polymeric domains relative to said array of second phase separated polymeric domains; and forming an array of semiconductor fins in an upper semiconductor material portion of said semiconductor substrate utilizing said array of second phase separated polymeric domains as an etch mask.