Patent ID: 8227172

Claim:
A method of producing a semiconductor device comprising: forming a coating film by applying a resist underlayer film forming composition containing a polymer, a crosslinker and a photoacid generator on a semiconductor substrate; forming an underlayer film by irradiating light to the coating film; forming a photoresist by applying a photoresist composition on the underlayer film and heating the resultant layer; exposing the semiconductor substrate coated with the underlayer film and the photoresist to light; developing the photoresist after the exposure; dry etching the underlayer film using a developed resist pattern; and processing the semiconductor substrate with the obtained resist pattern, wherein the polymer consists of unit structures selected from the group consisting of a unit structure of Formula (1) having a hydroxyl group: wherein Q represents a divalent linking group linking P with R 1 ; R 1 represents a trivalent hydrocarbon group having 2 to 4 carbon atoms; P represents a bonding group constituting a main chain; and R 2 represents a hydrogen atom, a methyl group or a halogen atom; and a unit structure of Formula (2) having a hydroxyl group: wherein x and y represent the number of repeating units and x=5 to 5,000, y=2 to 5,000; Q represents a divalent linking group linking a carbon atom constituting a main chain with R 1 ; R 1 represents a trivalent hydrocarbon group having 2 to 4 carbon atoms; R 2 and R 3 represent a hydrogen atom, a methyl group or a halogen atom; R 4 represents a hydrogen atom, an unsubstituted or substituted alkyl group having 1 to 10 carbon atoms, an unsubstituted or substituted aralkyl group, an unsubstituted or substituted carbocyclic aromatic group, or an unsubstituted or substituted heterocyclic aromatic group; and an amount of a structural unit (A′) is 1 to 76 mol % and an amount of a structural unit (B) is 99 to 24 mol %.