Patent ID: 7504337

Claim:
A method of uniformly delayering an integrated circuit (IC) chip on a wafer, the method comprising: performing an ash on the wafer including an aluminum (Al) layer thereof and etching the aluminum (Al) layer; polishing an edge of the wafer using a slurry including an approximately 30 micrometer (μm) polishing particles; first removing the aluminum (Al) layer and at least one metal layer by polishing using a slurry including approximately 9 μm diamond polishing particles and a non-abrasive backside of a polishing sheet; second removing any remaining metal layers to a first metal layer by polishing using a slurry including approximately 3 μm diamond polishing particles and the non-abrasive backside of a polishing sheet; third removing any scratches by polishing using a slurry including approximately 1 μm diamond polishing particles and the non-abrasive backside of a polishing sheet; and fourth removing the first metal layer to a polyconductor layer by polishing using a colloidal slurry including approximately 0.25 μm diamond polishing particles.