Patent ID: 7125778
Filing Date: 2006-10-24
Classification: H01L

Abstract:
1. A method for fabricating a self-aligning mask in a configuration, which comprises the steps of: forming, on a semiconductor substrate, a second protrusion structure with a small top surface disposed at a distance from a first protrusion structure with a larger top surface, the first and second protrusion structures having the same height and constituting webs having differently sized cross sections with a trench formed therebetween, the small top surface and the larger top surface constituting the total top surface of the configuration; covering the first protrusion structure and the second protrusion structure with a covering layer, a first area of the covering layer covering the second structure protrusion having a smaller thickness than a second area of the covering layer covering the first protrusion structure, the covering step further including: removing the covering layer substantially homogeneously until the second protrusion structure being completely uncovered, and the first protrusion structure remaining completely covered by the covering layer.