Patent ID: 8490028
Filing Date: 2013-07-16
Classification: G03F

Abstract:
1. A method for determining, by means of a computer a photolithography mask for the manufacture of a microstructure by grey level etching of a resist layer, the mask comprising a plurality of elementary cells each comprising an opaque area arranged, in top view, in a non-peripheral portion of a transparent region or, conversely, in a transparent area arranged, in top view, in a non-peripheral portion of an opaque region, comprising the steps of: a) initializing the pattern of the mask in a first state; b) determining, by simulation, the profile of the microstructure which would result from the use of the mask according to the pattern; c) adjusting the pattern by modifying, in certain cells, the position of the opaque or transparent area within the cell; and d) forming the mask according to the pattern; and further comprising, between step b) and step c), a step of determination, for each cell, of the average error gradient between the simulated profile and a profile of the desired microstructure, in the profile portion corresponding to the cell.