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

Claim 13:
14. An etching solution suitable for the selective removal of TiSiN over hafnium oxide from a microelectronic device, consisting of:
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;
from about 10 to about 15 wt. % of a water-miscible organic solvent;
from about 0.4 to about 1 wt. % of at least one nitrogen containing compound selected from the group consisting of a C4-12 alkylamine, a polyalkylenimine, and a polyamine; and
water.