A method of designing and forming a mask used for projecting an image of
an integrated circuit design. After providing a mask element
corresponding to a portion of a design of an integrated circuit layout,
the method includes correcting the mask element using OPC techniques, and
fracturing the OPC-corrected mask element into a plurality of polygonal
segments. The method then includes identifying along an edge of the mask
element a polygon edge having a thickness less than that which can be
normally reproduced by a mask writer, and modifying configuration of the
identified mask element segment to add or subtract length to an end of
the polygon to create a corrected mask element having increased
resolution by the mask writer. The method then includes using an electron
beam or other mask writer to form a mask having the mask element with
modified configuration.