Patent ID: 8187978
Filing Date: 2012-05-29
Classification: H01L

Abstract:
1. A method of forming openings to a layer of a semiconductor device comprising: forming a barrier layer over the layer of the semiconductor device; forming a selector mask over the barrier layer, the selector mask comprising a plurality of selector mask openings; providing an element through the plurality of selector mask openings to modify portions of the barrier layer so that the barrier layer includes modified portions and unmodified portions; removing the selector mask; forming a dielectric layer over the barrier layer; forming a main mask on the dielectric layer, the main mask comprising a plurality of main mask openings arranged in a regular pattern extending over the dielectric layer, wherein the unmodified portions of the barrier layer are arranged to correspond to some of the plurality of main mask openings so as to select the some of the plurality of main mask openings; removing portions of the dielectric layer through the selected some of the plurality of main mask openings to the unmodified portions of the barrier layer; and removing the unmodified portions of the barrier layer to provide openings extending through the dielectric layer and the barrier layer to the layer.