Patent ID: 9748100
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A method of processing a substrate using a block copolymer composed of a first polymer containing an oxygen atom and a second polymer containing no oxygen atom, the method comprising: coating the block copolymer onto the substrate on which a predetermined pattern is formed; phase-separating the block copolymer into the first polymer and the second polymer, wherein, in phase-separating the block copolymer, the substrate onto which the block copolymer is coated is heated at a first temperature such that the block copolymer is phase-separated into the first polymer and the second polymer; and after phase-separating the block copolymer, supplying a non-oxidizing gas such that the substrate is kept in a low oxygen atmosphere, and heating the substrate in the low oxygen atmosphere to selectively remove the first polymer from the phase-separated block copolymer, wherein, heating the substrate in the low oxygen atmosphere is performed at a second temperature higher than the first temperature, and wherein the first polymer is polymethyl methacrylate and the second polymer is polystyrene.