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

Claim 15:
16. An etching solution suitable for the selective removal of TiSiN over hafnium oxide from a microelectronic device, consisting of:
about 4.2 wt. % of ammonium hydroxide (neat);
about 4.3% of hydrogen peroxide (neat);
from about 0.4 to about 1.2 wt. % of ammonium fluoride (neat);
about 10% of a water-miscible organic solvent;
from about 0.30 to about 1% of at least one nitrogen containing compound selected from the group consisting of a C4-12 alkylamine, a polyalkylenimine, and a polyamine; and
water.