Patent ID: 8092978

Claim:
A positive resist composition for an electron beam, an X-ray or EUV, comprising: (A) a resin capable of decomposing by the action of an acid to increase the dissolution rate in an aqueous alkali solution, said resin containing a hydroxystyrene repeating unit; (B) a compound capable of generating an acid upon irradiation with an actinic ray or radiation, represented by the following formula (ZI) or (ZII); (C) a basic compound; and (D) an organic solvent, wherein a concentration of all solid contents in said composition is from 1.0 to 4.5 mass %, and a total amount of the compound represented by formula (ZI) or (ZII) is 12 mass % or more based on all solid contents in said composition: wherein each of R 201 , R 202 and R 203 independently represents an organic group, any two members out of R 201 to R 203 may combine together to form a ring which may contain an oxygen atom, a sulfur atom, an ester bond, an amide bond, a carbonyl group or a —SO 2 — structure, each of R 204 and R 205 independently represents an aryl group, an alkyl group or a cycloalkyl group, and Z − represents an anion represented by the following formula (Za) or (Zb): wherein each of R 1 and R 2 independently represents a fluorine atom or an alkyl group, and R 1 and R 2 may combine together to form a ring; and each of R 3 to R 5 independently represents a fluorine atom or an alkyl group, and any two members out of R 3 to R 5 may combine together to form a ring.