Patent ID: 6553562
Filing Date: 2003-04-22
Classification: G03F

Abstract:
A method of generating complementary masks for use in a multiple-exposure lithographic imaging process, said method comprising the steps of:identifying horizontal critical features from a plurality of features forming a layout, identifying vertical critical features from said plurality of features, said vertical critical features extending in a direction orthogonal to said horizontal critical features, identifying interconnection areas, said interconnection areas comprising areas in which one of said horizontal critical features contacts another feature of said layout, and/or areas in which one of said vertical features contacts another feature of said layout, defining a set of primary parameters on the basis of the proximity of said plurality of features relative to one another, generating an edge modification plan for each interconnection area based on said primary parameters, generating a first shielding plan for said horizontal critical features on the basis of said primary parameters, generating a second shielding plan for said vertical critical features on the basis of said primary parameters, generating a first mask by compiling said horizontal critical features, said second shield plan for said vertical critical features and said interconnection areas containing a horizontal critical feature modified by said edge modification plan, and generating a second mask by compiling said vertical critical features, s aid first shield plan for said horizontal critical features and said interconnection areas containing a vertical critical feature modified by said edge modification plan.