Patent ID: 8262928
Filing Date: 2012-09-11
Classification: C23F,H01L

Abstract:
1. An etchant, comprising: about 0.1 percent by weight to about 30 percent by weight of ammonium persulfate (NH about 0.1 percent by weight to about 10 percent by weight of an inorganic acid; about 0.1 percent by weight to about 10 percent by weight of an acetate salt; about 0.01 percent by weight to about 5 percent by weight of a fluorine-containing compound; about 0.01 percent by weight to about 5 percent by weight of a sulfonic acid compound; about 0.01 percent by weight to about 2 percent by weight of an azole compound; and a remainder of water, wherein the etchant does not include hydrogen peroxide.