Patent ID: 6035113
Filing Date: 2000-03-07
Classification: H01J

Abstract:
A method for formulating an exposure dose for an electron beam on a resist film for a pattern of geometric shapes which compensates for electron scattering effects, the method comprising the steps of:providing design data in hierarchial form, the design data consisting of a library of a plurality of cell types specifying the geometric shapes and their location within the respective cell,searching the design data to identify shapes or cells which interact over a forward scatter range, the interacting shapes or cells being intrusions,modifying the hierarchial design data to account for the intrusions,computing a forward scatter dose correction on a shape-to-shape basis for the modified hierarchial design data,storing the data indicative of said forward scatter dose compensation,generating a fractional density matrix from the hierarchial library data, where the matrix grid size is a function of a back scatter range,computing a proximity matrix based on the back scatter range,computing a dose matrix by convolving the fractional density matrix and the proximity matrix,determining the back scatter dose correction based on the fractional density matrix, proximity matrix and dose matrix, andcomputing the final corrected dose for each shape in the pattern, said final corrected dose utilized by an electron beam pattern generation tool for patterning geometric shapes in a resist film with reduced electron scattering effects.