Patent ID: 10035929

Abstract:
The present disclosure relates to a method of forming a CMP slurry that is free of pH-adjusters (i.e., chemicals added solely for the purpose of adjusting a pH of a CMP slurry), and an associated a pH-adjuster free CMP slurry. In some embodiments, the method is performed by forming a CMP slurry having a first pH value. A desired pH value of the CMP slurry is determined. A chelating agent configured to bond to metallic ions is provided to the CMP slurry. The chelating agent is configured to adjust a pH value of the CMP slurry from the first pH value to the desired pH value. By using the chelating agent to adjust a pH value of the CMP slurry to achieve a desired pH value, the method is able to form a CMP slurry that is free of pH-adjusters, thereby reducing the cost and complexity of the CMP slurry.