Patent ID: 9136137
Filing Date: 2015-09-15
Classification: C23F,H01L

Abstract:
1. An etchant composition comprising: 0.5 wt % to 20 wt % of a persulfate; 0.01 wt % to 1 wt % of a fluorine compound; 1 wt % to 10 wt % of an inorganic acid; 0.01 wt % to 2 wt % of an azole-based compound; 0.1 wt % to 5 wt % of a chlorine compound; 0.05 wt % to 3 wt % of a copper salt; 0.01 wt % to 5 wt % of an antioxidant or a salt thereof comprising ascorbic acid, glutathione, lipoic acid, uric acid, or a salt thereof, based on a total weight of the etchant composition; and water in an amount sufficient for the total weight of the etchant composition to be equal to 100 wt %.