Patent ID: 6487511
Filing Date: 2002-11-26
Classification: H01L

Abstract:
A method for determining a cumulative defect measure for a wafer lot, comprising:selecting a wafer lot to be inspected; selecting at least one wafer from said wafer lot for inspection, said at least one wafer comprising a plurality of process layers, at least some of said process layers selected for inspection for defects; determining the number, type, and kill ratio of said defects on each process layer of said at least one wafer selected for inspection; determining a cumulative defect measurement for said at least one wafer based upon the number, type, and kill ratio of said defects on all inspected process layers on said at least one wafer; and extrapolating said cumulative defect measurement for said at least one wafer to determine a quantified indication of a defectiveness of said selected wafer lot.