Patent ID: 9741583
Date: 2017-08-22
CPC Classifications: B82Y,G03F,H01L,Y10S

Claim:
1. A substrate treatment method of treating a substrate using a block copolymer containing a hydrophilic polymer and a hydrophobic polymer, the substrate treatment method comprising: a resist pattern formation step of forming a plurality of circular patterns of a resist film on the substrate; a first block copolymer coating step of applying a first block copolymer to the substrate after the formation of the circular patterns of the resist film; a first polymer separation step of phase-separating the first block copolymer into the hydrophilic polymer and the hydrophobic polymer; a first polymer removal step of selectively removing the hydrophilic polymer from the phase-separated first block copolymer; a resist removal step of selectively removing the resist film from a top of the substrate; a second block copolymer coating step of applying a second block copolymer to the substrate after the removal of the resist; a second polymer separation step of phase-separating the second block copolymer into the hydrophilic polymer and the hydrophobic polymer; and a second polymer removal step of selectively removing the hydrophilic polymer from the phase-separated second block copolymer, wherein a ratio of a molecular weight of the hydrophilic polymer in the first block copolymer and the second block copolymer is 20% to 40%.