Patent ID: 9293565
Filing Date: 2016-03-22
CPC Classification: C09K,C23F,H01L

Claim Text:
1. An etchant composition comprising: 0.5 weight % to 20 weight % of persulfate, 0.01 weight % to 2 weight % of a fluoride compound, 1 weight % to 10 weight % of an inorganic acid, wherein the inorganic acid is at least one of nitric acid, sulphuric acid, phosphoric acid, and perchloric acid, 0.5 weight % to 5 weight % of a cyclic amine compound, 0.1 weight % to 10.0 weight % of a compound having an amino group and a sulfonic acid, 0.1 weight % to 15.0 weight % of an organic acid or a salt thereof, and water to a total of 100 weight % of the etchant composition, wherein the weight percents are based on a total weight of the etchant composition.