Patent ID: 8426103

Claim:
A positive resist composition for use with electron beam, X-ray or EUV, comprising: a resin capable of decomposing under an action of an acid to increase a dissolution rate in an aqueous alkali solution; a compound capable of generating an acid upon irradiation with actinic rays or radiation; a basic compound; and an organic solvent, wherein the entire solids content concentration in the resist composition is from 1.0 to 4.5 mass %, the ratio of (B) the compound capable of generating an acid upon irradiation with actinic rays or radiation is from 10 to 50 mass % based on the entire solids content, and (A) the resin capable of decomposing under an action of an acid to increase the dissolution rate in an aqueous alkali solution has a repeating unit represented by formula (II) and a repeating unit represented by formula (III): wherein each R 01 independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group; L 1 and L 2 , which may be the same or different, each represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group; M represents a single bond or a divalent linking group; Q represents an alkyl group, a cycloalkyl group, an aryloxy group or an alicyclic or aromatic cyclic group which may contain a hetero atom; at least two members out of Q, M and L 1 may combine to form a 5- or 6-membered ring; A represents a halogen atom, a cyano group, an acyl group, an alkyl group, an alkoxy group, an acyloxy group or an alkoxycarbonyl group, and when a plurality of A's are present, the plurality of A's may be the same or different; and m and n each independently represents an integer of 0 to 4.