Patent ID: 8434034
Filing Date: 2013-04-30
Classification: G03F

Abstract:
1. A computer-implemented method of making Optical Proximity Correction to an original gate photomask pattern, the original gate photomask pattern being used for a gate on a substrate and comprising an active area gate photomask pattern and a shallow-trench isolation gate photomask pattern, characterized in that the method comprises: creating a first optical proximity effect model of for the gate on an active area of the substrate and a second optical proximity effect model for the gate on a shallow-trench isolation of the substrate respectively; separating the active area gate photomask pattern of the original gate photomask pattern from the shallow-trench isolation gate photomask pattern of the original gate photomask pattern; making an Optical Proximity Correction to the separated active area gate photomask pattern using the first optical proximity effect model so as to obtain a corrected active area gate photomask pattern, while making an Optical Proximity Correction to the separated shallow-trench isolation gate photomask pattern using the second optical proximity effect model so as to obtain a corrected shallow-trench isolation gate photomask pattern; combining the corrected active area gate photomask pattern with the corrected shallow-trench isolation gate photomask pattern to obtain a corrected gate photomask pattern to be used in photolithography process.