Patent ID: 9091916
Filing Date: 2015-07-28
Classification: G03F

Abstract:
1. A positive photoresist composition comprising an acid generator (A) capable of generating an acid when irradiated with an active ray or radiation, a resin (B) whose solubility in alkali increases under the action of acid, an alkali-metal salt (C), and an organic solvent (S), wherein the alkali-metal salt (C) is represented by the following formula (C1): wherein in formula (C1), W + represents an alkali-metal ion; X n− represents a monovalent counteranion; and n represents 1, wherein the monovalent counteranion is selected from the group consisting of anions represented by the following formulae (C2) to (C14): wherein in formula (C2), R c1 represents an alkyl group in which 80% or more of the hydrogen atoms are substituted by fluorine atoms; j represents the number of R c1 s and represents an integer from 1 to 5; and the R c1 s in the number of j may be respectively identical to or different from each other; in formula (C3), R c2 to R c5 each independently represents a fluorine atom or a phenyl group; and some or all of the hydrogen atoms of the phenyl group may be substituted by at least one selected from the group consisting of a fluorine atom and a trifluoromethyl group; in formula (C4), R c6 represents a group represented by the following formula (C4-1), (C4-2), or (C4-3); in formula (C4-1), x represents an integer from 1 to 4; in formula (C4-2), R c6-1 represents a hydrogen atom, a hydroxyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, or a linear or branched alkoxy group having 1 to 6 carbon atoms; and y represents an integer from 1 to 3; in formulae (C5) to (C7), v0 represents an integer from 0 to 3; q1 and q2 each independently represents an integer from 1 to 5; q3 represents an integer from 1 to 12; r1 and r2 each independently represents an integer from 0 to 3; i represents an integer from 1 to 20; t3 represents an integer from 1 to 3; R c7 represents a substituent; and R c8 represents a hydrogen atom, an alkyl group or a halogenated alkyl group having 1 to 5 carbon atoms; in formulae (C8) to (C12), t3 and R c7 have the same definitions as t3 and R c7 in formulae (C5) to (C7), respectively; Q b2 represents an alkylene group which may contain an oxygen atom or a sulfur atom, an oxygen atom or a sulfur atom; m1 to m5 each independently represents 0 or 1; v1 to v5 each independently represents an integer from 0 to 3; and w1 to w5 each independently represents an integer from 0 to 3; and in formulae (C13) and (C14) X c1 represents an alkylene group having 2 to 6 carbon atoms in which at least 1 hydrogen atom is substituted by a fluorine atom; and Y c1 and Z c1 each independently represent an alkyl group having 1 to 10 carbon atoms in which at least 1 hydrogen atom is substituted by a fluorine atom.