Patent ID: 11932590
Assignee: TOKUYAMA CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. An inhibitor for RuO4 gas generation comprising an onium salt consisting of an onium ion and a bromine-containing ion,
wherein a pH of the inhibitor for RuO4 gas generation at 25° C. is 8 or more and 14 or less,
wherein the onium salt is a quaternary onium salt expressed by Formula (1):, wherein A+ is an ammonium ion or a phosphonium ion; and R1, R2, R3, and R4 are independently an alkyl group with a carbon number from 2 to 25, an allyl group, an aralkyl group having an alkyl group with a carbon number from 1 to 25, or an aryl group, wherein at least one hydrogen atom in a ring of an aryl group in the aralkyl group, or the aryl group may be replaced with a fluorine atom, a chlorine atom, an alkyl group with a carbon number from 1 to 10, an alkenyl group with a carbon number from 2 to 10, an alkoxy group with a carbon number from 1 to 9, or an alkenyloxy group with a carbon number from 2 to 9; and in these groups, at least one hydrogen atom may be replaced with a fluorine atom or a chlorine atom, and X− is the bromine-containing ion; and
wherein the RuO4 gas is associated with the manufacturing process for semiconductor elements.