Patent ID: 11946148
Assignee: VERSUM MATERIALS US, LLC
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. An etching solution suitable for the selective removal of TiSiN over hafnium oxide from a microelectronic device, consisting of:
water;
from about 3.7 to about 4.5 wt. % neat of at least one alkaline ammonium compound selected from the group consisting of ammonium hydroxide;
from about 3.9 to about 4.5 wt. % neat of at least one peroxide compound;
a water-miscible organic solvent; and
at least one nitrogen containing compound selected from the group consisting of a C4-12 alkylamine, a polyalkylenimine, and a polyamine; and
optionally a surfactant.