Patent ID: 7335455

Claim:
A method of forming an underlayer of a bi-layer resist film, comprising: forming a blended material by blending a polymer having an aromatic group and a methacrylate polymer represented by the following chemical formula: wherein, R 1 is one selected from a group consisting of an aromatic compound, a hydrocarbon of 1 to 5 carbon atoms, an aliphatic hydrocarbon of 1 to 15 carbon atoms, a lactone of 1 to 15 carbon atoms, an ether of 1 to 15 carbon atoms and a carboxylic acid of 1 to 15 carbon atoms, R 2 is a hydrogen or a methyl group, and m is an integer ranging from 10 to 500; coating a substrate with the blended material; and irradiating the blended material coated on the substrate with an e-beam to form said underlayer, and wherein the polymer having the aromatic group is a novolac polymer or a naphthalene polymer.