Patent ID: 6051347
Filing Date: 2000-04-18
Classification: G03F,Y10S

Abstract:
A method of e-beam over-correction to compensate optical proximity effect for a pattern formed in an optical lithography process comprising the steps of:providing a mask substrate having a metal layer formed thereon;providing an electron-beam having a circular spot;forming a layer of e-beam sensitive resist over said metal layer;generating clear-out e-beam exposure dosage data for said e-beam sensitive resist;generating optical proximity e-beam exposure dosage data;superimposing said optical proximity e-beam exposure dosage data onto said resist clear-out dosage data to form a compensated data;generating an electron back-scatter data corresponding to said compensated data;superimposing said electron back-scatter data onto said compensated data to form an e-beam proximity data;e-beam exposure writing into said e-beam resist with said e-beam of circular spot using said e-beam proximity data;developing said e-beam resist to form a pattern corresponding to said e-beam proximity data in said e-beam resist;transferring said pattern from said e-beam resist into said metal layer by etching said metal; andremoving said e-beam resist to complete the forming of the patterned metal layer.