Patent ID: 11929257
Assignee: VERSUM MATERIALS US, LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 0:
1. An etching solution suitable for at least partially removing aluminum nitride from a microelectronic device during manufacture of the device, the solution comprising:
water;
a cationic surfactant having a structure represented by Formula A:, wherein, each of R1, R2, R3, and R4 is independently hydrogen, a substituted or unsubstituted C1-C30 alkyl, a substituted or unsubstituted C3-C8 cycloalkyl, a substituted or unsubstituted C2-C30 alkenyl, a substituted or unsubstituted aralkyl, a substituted or unsubstituted aryl, or a substituted or unsubstituted heteroaryl, wherein not all of R1, R2, R3, and R4 are hydrogen; and
X is an anionic counterion;
a water-miscible organic solvent; and
greater than 10% by weight of base comprising potassium hydroxide,
wherein the etching solution is free of solid materials, fluoride, oxidizers, peroxides, inorganic acids, and organic acids.