Patent ID: 9193904
Filing Date: 2015-11-24
Classification: C09K,H01L

Abstract:
1. An etchant composition used to etch a silicon-containing film formed on a target substrate, said composition comprising: at least one additive selected from the group consisting of an organic compound containing a hydroxyl group, an organic compound containing a carbonyl group, an inorganic acid and inorganic salt, hydrofluoric acid, ammonium fluoride, and an organic acid; wherein the etchant composition has a property to prevent corrosion of aluminum films and aluminum alloy films; wherein a concentration of the hydrofluoric acid in an entire etching solution ranges from 0.5 weight % to 15 weight %, a concentration of the ammonium fluoride in the entire etching solution ranges from 5 weight % to 30 weight %, a concentration of the organic acid in the entire etching solution ranges from 5 weight % to 70 weight %, and a concentration of additives in the entire etching solution ranges from 1 weight % to 70 weight %.