Patent ID: 8057986

Claim:
A resist pattern, comprising: a resist pattern formed by a method for forming a resist pattern which comprises: A) a step for selectively exposing a resist film formed by a resist material using an exposure light having a wavelength of less than 300 nm; and B) a step for selectively exposing the resist film formed by the resist material using an exposure light having a wavelength of 300 nm or more; wherein the resist material comprises: a) a first photo-acid generator exhibiting an absorption peak to exposure light having a wavelength of less than 300 nm, wherein the first photo-acid generator is an onium salt compound expressed by (R 1 ) + X âˆ’ , where Xâˆ’ is an anion, and (R 1 ) + is selected from the group consisting of the compounds expressed by formulae below: wherein R 2 represents a substituent group; b) a second photo-acid generator exhibiting an absorption peak to exposure light having a wavelength of 300 nm or more, wherein the second photo-acid generator is selected from the group consisting of the compounds expressed by formulae below, (c) a resin of a polarity changeable type, wherein 5-80% of all polar groups in the resin are substituted by a protective group, wherein the protective group is eliminated by an acid resulting from the first and second photo-acid generators, and wherein the protective group is a hydrophobic protective group which is an adamantyl or norbornane functional group expressed by the formula below, where â€œR 1 â€ represents a straight chain, branched or cyclic alkyl group having 1 to 4 carbon atoms, which may be substituted or non-substituted, and â€œZâ€ represents a plurality of atoms which forms one of a substituted or non-substituted adamantyl group, and a substituted or non-substituted norbornane functional group, wherein the resist material is a positive resist material.