Patent ID: 11939505
Assignee: ENF TECHNOLOGY CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A silicon nitride film etching composition comprising: a phosphoric acid, a quaternary ammonium silicate, a silicon compound represented by the following Chemical Formula 1, and a residual amount of water:, wherein
R1 is C1-20 aminoalkyl and —CH2— of the alkyl may be replaced with —NR′— or —O— in which R′ is hydrogen or C1-7 alkyl;
R2 to R4 are independently of one another hydrogen, a halogen, amino, cyano, hydroxy, C1-20 alkoxy, C1-20 alkyl, C1-20 aminoalkyl, or, in which R11 to R14 are independently of one another hydrogen, C1-20 alkyl, or C1-20 hydroxyalkyl;
L1 is C1-20 alkylene and —CH2— of the alkylene may be replaced with —O—, —NR″—, or a combination thereof in which R″ is hydrogen or C1-7 alkyl;
a is an integer selected from 0 to 10; and
b is an integer selected from 1 to 3.