Patent ID: 8206886

Claim:
A photosensitive composition comprising: (A) a sulfonium salt represented by formula (I-a) wherein the salt of formula (I-a) is a compound (I-al): where compound (I-al) is an arylsulfonium compound not including an acid decomposable group as a substituent, and further where compound (I-al) is an aryldialkylsulfonium compound in which R 201 in formula (I-a) represents an aryl group and R 202 and R 203 each represents an alkyl group, and wherein the two alkyl groups represented by R 202 and R 203 are bonded with each other to form a ring; and wherein X − represents an anion represented by formula (I) or (II): wherein Y represents an alkylene group substituted with at least one fluorine atom, and R represents a cycloalkyl group, or an alkyl group selected from the group consisting of a non-fluorinated alkyl group and a perfluoroalkyl group, said perfluoroalkyl group being selected from the group consisting of a pentafluoroethyl group, a heptafluoropropyl group, a nonafluorobutyl group and a perfluoroethoxyethyl group; and (B) a fluorine-free resin comprising a repeating unit having a monocyclic or polycyclic hydrocarbon structure and having an alcoholic hydroxyl group, that decomposes by an action of an acid to increase a solubility of the resin in an alkali developer.