Patent ID: 9169437
Filing Date: 2015-10-27
Classification: C03C,C09K,C23F

Abstract:
1. An etching method, comprising: bringing a layer of a metal selected from the group consisting of titanium, niobium, tungsten, molybdenum, ruthenium, rhodium, arsenic, aluminum and gallium, an oxide of the metal, a nitride of the metal, silicon nitride, hafnium nitride, tantalum nitride, and an alloy of these metals, said layer being provided on an underlying base material selected from the group consisting of glass, silicon, copper and nickel, into contact with an etching solution which consists essentially of at least one complexing agent selected from Formulas (I) and (II) and wherein the pH of said etching solution is 11 or higher, thereby selectively etching said metal; wherein R wherein R