Patent ID: 9472420
Filing Date: 2016-10-18
CPC Classification: C09K,H01L

Claim Text:
1. An aqueous composition for selectively removing titanium nitride (TiN or TiNxOy) from a semiconductor device comprising Cu, W, low-k dielectric material and the titanium nitride, comprising: a weakly coordinating anion having negative charge highly dispersed throughout its structure; an amine salt buffer; at least two non-oxidizing trace metal ions and the remaining is solvent selected from the group consisting of water, glycol, propylene glycol, lactic acid, acetic acid, sulfolanes, dimethyl sulfoxide, alkyl sulfone, and combinations thereof; wherein the aqueous composition (1) contains no non-ambient oxidizer; (2) is exposed to air, and (3) has a pH less than 7.