Patent ID: 9613820
Date: 2017-04-04
CPC Classifications: B81C,G03F,H01L

Claim:
1. A method of forming patterns, comprising the steps of: providing a substrate having a target layer thereon; coating a photoresist layer onto the target layer; performing a photolithographic process to pattern the photoresist layer into a plurality of first resist patterns; depositing a directed self-assembly (DSA) material layer in a blanket manner on the first resist patterns, wherein the DSA material layer fills up gaps between the first resist patterns; subjecting the DSA material layer to a self-assembling process so as to form repeatedly arranged block copolymer patterns in the DSA material layer, wherein the repeatedly arranged block copolymer patterns are aligned corresponding to the first resist patterns and the gaps; removing undesired portions being not positioned directly above the first resist patterns from the DSA material layer to form second resist patterns on the target layer wherein the second resist patterns covers each of the plurality of first resist patterns; and using the second resist patterns and the plurality of first resist patterns together as an etch hard mask, performing an etching process to transfer the second resist patterns to the target layer.