Patent ID: 9129812
Filing Date: 2015-09-08
Classification: C09D,G03F,H01L

Abstract:
1. In a method for making a semiconductor device, a method for making a patterned mask on a substrate by use of directed self-assembly (DSA) of a block copolymer (BCP) having a natural pitch L 0 , the method comprising: forming on the substrate a patterned sublayer with generally parallel and generally straight stripes having a stripe pitch L depositing on the patterned sublayer a solution comprising a first BCP of polymers A and B without functional groups, a polymer C with a functional group and a polymer D with a functional group; annealing said deposited solution to cause polymers C and D to self assemble and bind to the patterned sublayer; removing the first BCP and unbound polymers, leaving the self-assembled bound polymers C and D; depositing on the self-assembled bound polymers C and D a layer of a second BCP of polymers C and D without functional groups; annealing said layer of second BCP to cause DSA of the second BCP into alternating lines of polymers C and D; and removing the lines of one of the polymers of the second BCP, leaving the lines of the other of the polymers of the second BCP as a mask of generally parallel and generally straight lines with a line pitch of approximately L