Patent ID: 10508344

Abstract:
Formulations for stabilizing hydrogen peroxide, comprising water soluble Zn+2 ions at 0.7 to 100 parts per million of an alkaline hydrogen peroxide solution. In some examples, the alkaline hydrogen peroxide solution is a silicon wafer cleaning solution comprised of H2O2 and NH4OH—H2O and the water soluble Zn+2 ions are present at 3 to 100 parts per million of the silicon wafer cleaning solution. In some examples, the alkaline hydrogen peroxide solution is a wet etching formulation selective for TiN and the water soluble Zn+2 ions are present at 0.7 to 10 parts per million of the wet etching formulation. In some examples, the alkaline hydrogen peroxide solution is a wet etching formulation selective for Ti and Zn ions are present at 2 to 7 parts per million.