Patent ID: 8894876

Claim:
A metal wiring etchant composition, the etchant comprising: hydrogen peroxide at about 6 wt % to about 12 wt %; an oxidant at about 1 wt % to about 2 wt %; a fluoride-based compound at about 0.2 wt% to about 0.7 wt %; a nitrate-based compound at about 0.5 wt% to about 3 wt %; wherein the nitrate-based compound comprises nitric acid, potassium nitrate, ammonium nitrate, sodium nitrate, or a combination comprising at least one of the foregoing and a boron-based compound at about 0.05 wt % to about 1 wt %; wherein the boron-based compound comprises boric acid, borate, boron oxide, borazole, or a combination comprising at least one of the foregoing; and wherein the metal wiring comprises at least one of a copper layer, a copper alloy layer, a titanium layer, a titanium alloy layer, a molybdenum layer, a molybdenum alloy layer, and a multilayer thereof, and wherein when the metal wiring comprises the multilayer, the metal layer comprises a first layer including copper and a second layer comprising at least one of titanium or molybdenum.