Patent ID: 9123583
Filing Date: 2015-09-01
Classification: G01B,G01N,G03F,H01L

Abstract:
1. A method of screening a wafer with a plurality of reticle fields, the method comprising: modeling a topography over a surface of the wafer based on a plurality of first alignment shapes in a first layer overlying the surface to generate a modeled topography for the first layer, wherein the plurality of first alignment shapes is spaced over the surface with a first resolution; measuring the topography with a second resolution greater than the first resolution to generate a measured topography for the first layer; determining a plurality of first non-correctable errors for the first layer as a difference between the modeled topography and the measured topography, wherein the plurality of first non-correctable error are determined at a plurality of locations across the surface of the wafer; determining a maximum first non-correctable error from the plurality of first non-correctable errors for each reticle field of the plurality of reticle fields; and discarding the wafer or re-disposing the first layer if the maximum first non-correctable error within one or more reticle fields is above a first threshold.