Patent ID: 11912902
Assignee: nan
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A composition for etching, comprising,
a first inorganic acid,
a first additive represented by Chemical Formula 1, and
a solvent,
wherein the first inorganic acid is phosphoric acid, wherein the composition for etching selectively etches a nitride layer with respect to an oxide layer,
wherein etch selectivity of the composition for etching is from 24.86 to 6512., (In Chemical Formula 1, X is N,
R1 to R6 are each, independently, selected from the group consisting of hydrogen, a C1-C20 alkyl group, a Cl-C20 alkoxy group, a C2-C20 alkenyl group, a C3-C20 cycloalkyl group, a C1-C20 aminoalkyl group, a C6-C20 aryl group, a C1-C20 alkyl carbonyl group, a C1-C20 alkyl carbonyloxy group, and a C1-C10 cyano alkyl group).