Radiation-sensitive resin composition
A radiation-sensitive resin composition includes a resin that includes a repeating unit shown by the following formula (1) and a solvent. The radiation-sensitive resin composition has an excellent performance as a radiation-sensitive acid generator, includes a resin that adversely affects the environment and a human body to only a small extent, and can form a resist film that has a high resolution and forms an excellent resist pattern. wherein R 1 represents a hydrogen atom or the like, M + represents a specific cation, and n represents an integer from 1 to 5.
1. A radiation-sensitive resin composition comprising a resin and a solvent, the resin including a repeating unit shown by the following general formula (1),
wherein R 1 represents a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 3 carbon atoms, provided that some or all of the hydrogen atoms of the alkyl group may be replaced by a fluorine atom, M + represents a sulfonium cation shown by the following general formula (2) or an iodonium cation shown by the following general formula (3), and n represents an integer from 1 to 5,
wherein R 2 , R 3 , and R 4 individually represent a substituted or unsubstituted linear or branched alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted monovalent cyclic hydrocarbon group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or an unsubstituted monovalent heterocyclic organic group having 4 to 30 atoms, or a substituent having a ring wherein two or more of R 2 , R 3 , and R 4 are bonded via the sulfur atom,
wherein R 5 and R 6 individually represent a substituted or unsubstituted linear or branched alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted monovalent cyclic hydrocarbon group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or an unsubstituted monovalent heterocyclic organic group having 4 to 30 atoms, or a substituent having a ring wherein R 5 and R 6 are bonded via the iodine atom.