Patent Document ID: 20120046775
Application ID: 12860572
Patent Flag: 0

Claim One:
1. A method for enhancing wafer exposure effectiveness and efficiency, which comprising the steps of: (a) identifying independent variables and dependent variables; (b) collecting data associated with a plurality of wafers and masks, wherein each of the masks is used to pattern a plurality of dies on each wafer, the exposure field and the mask field are defined on the mask; (c) computing parameters of OWE and MFU respectively for each wafer, wherein the OWE is defined by the fraction of the area of good dies produced on each wafer to the total area of each wafer, and the MFU is the fraction of the area of the exposure field to the area of the mask field; (d) calculating an index of MOWE for each OWE and its corresponding MFU as one of the dependent variables, wherein the MOWE is the product of the OWE and the MFU; and (e) constructing a model tree for the MOWE in terms of the independent variables.