Composition for forming antireflection film, laminate, and method for forming resist pattern
An antireflection film-forming composition having excellent coatability, capable of significantly inhibiting production of fine microbubbles and capable of forming an antireflection film with a sufficiently decreased standing-wave effect, and having excellent solubility in water and alkaline developers is provided. The composition comprises a polymer having at least one polymerization unit with a hydroxyl group-containing organic group on the side chain, preferably a copolymer having at least one recurring unit of the following formula (2) and/or at least one recurring unit of the following formula (3) and at least one recurring unit of the following formula (4), and/or a salt thereof: wherein R 1 and R 2 represent a hydrogen atom, a fluorine atom, or a monovalent organic group, m is an integer of 1-20, and A represents a divalent coupling means.
1. An antireflection film-forming composition comprising a copolymer having at least one recurring unit of the following formula (2) and/or at least one recurring unit of the following formula (3) and at least one recurring unit of the following formula (4):
wherein R1 and R2 individually represent a hydrogen atom, a fluorine atom, or a monovalent organic group and m is an integer of 1-20,
wherein R1 represents a hydrogen atom, a fluorine atom, or a monovalent organic group and A represents a divalent coupling means.
2. The antireflection film-forming composition according to claim 1 , wherein the recurring unit represented by the formula (4) has at least one recurring unit originating from a compound selected from the group consisting of vinylsulfonic acid, allylsulfonic acid, and 2-acrylamide-2-methylpropanesulfonic acid.
3. The antireflection film-forming composition according to claim 1 , further comprising a surfactant.
4. The antireflection film-forming composition according to claim 3 , wherein the surfactant has a solubility in water at 20° C. of 0.01 wt % or more.
5. The antireflection film-forming composition according to claim 4 , wherein the surfactant is added in an amount of 0.001-50 wt % for the amount of the polymer.
6. The antireflection film-forming composition according to claim 4 , wherein the surfactant is added in an amount of 0.001-50 wt % for the amount of the polymer.
7. The antireflection film-forming composition according to claim 2 , further comprising a surfactant.
8. A laminate comprising a resist film and an antireflection film formed from the antireflection film-forming composition according to claim 1 on the resist film.
9. A laminate comprising a resist film and an antireflection film formed from the antireflection film-forming composition according to claim 2 on the resist film.
10. A process of forming a resist pattern by forming a resist film on the surface of a substrate comprising previously forming an antireflection film from the antireflection film-forming composition according to claim 1 on the resist film, exposing the resist film to radiation to form a prescribed pattern, developing the resist film, and removing the antireflection film.
11. The process according to claim 10 , wherein the resist film is developed using an alkaline developer to remove simultaneously both the antireflection film and the resist film in the development process.
12. A process of forming a resist pattern by forming a resist film on the surface of a substrate, comprising previously forming an antireflection film from the antireflection film-forming composition according to claim 2 on the resist film, exposing the resist film to radiation to form a prescribed pattern, developing the resist film, and removing the antireflection film.