Patent ID: 7141507
Filing Date: 2006-11-28
Classification: H01L

Abstract:
1. A method for production of a semiconductor structure, comprising: making available a semiconductor substrate; providing a lower, first mask layer, a middle, second mask layer and an upper, third mask layer on a surface of the semiconductor substrate; forming at least one first window in the upper, third mask layer; patterning the middle, second mask layer using the first window in the upper, third mask layer to transfer the first window into the middle, second mask layer; patterning the lower, first mask layer using the first window in the middle, second mask layer to transfer the first window into the lower, first mask layer; increasing the size of the first window in the upper, third mask layer to form a second window in the upper, third mask layer in a maskless process step; repatterning the middle, second mask layer using the second window in the upper, third mask layer to transfer the second window into the middle, second mask layer; patterning the semiconductor substrate using the patterned lower, third mask layer; repatterning the lower, first mask layer using the second window in the middle, second mask layer; and repatterning the semiconductor substrate using the repatterned lower, third mask layer.