Patent ID: 7910281

Claim:
A positive resist composition for a thin-film implantation process comprising: a resin component (A) with an acid-dissociable dissolution inhibiting group, whose alkali solubility increases by the action of an acid; an acid generator component (B) which generates an acid by irradiation with radiation; and a compound (C) having a radiation absorbing ability, wherein said resin component (A) comprises a structural unit (a1) derived from a hydroxystyrene and a structural unit (a2) obtained by substituting the hydrogen atom in a hydroxyl group of said structural unit (a1) with an acid-dissociable dissolution inhibiting group, said acid-dissociable dissolution inhibiting group contains an acid-dissociable dissolution inhibiting group (II) represented by the following general formula (II) as a main component: [wherein, X represents an alicyclic group, an aromatic cyclic hydrocarbon group, or an alkyl group having 1 to 5 carbon atoms, R 1 represents an alkyl group having 1 to 5 carbon atoms, or alternatively, X and R 1 each represents, independently, an alkylene group having 1 to 5 carbon atoms, in which an end of X and an end of R 1 may be bonded with each other; and R 2 represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom], said acid generator component (B) comprises diazomethane based acid generators, and said compound (C) having the radiation absorbing ability comprises ester compounds of a phenol compound and 1,2-naphthoquinonediazido-5-sulfonyl chloride or 1,2-naphthoquinonediazido-4-sulfonyl chloride.