Patent ID: 8853048
Filing Date: 2014-10-07
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: forming a mask over a semiconductor substrate, the mask comprising a layer of a material, wherein the layer has a thickness and openings; etching the semiconductor substrate where it is exposed through the openings of the layer to form two or more trenches in the semiconductor substrate, each trench corresponding to a different one of the openings; etching the layer isotropically, wherein etching extends the openings of the layer; forming a dielectric liner in the trenches; depositing conductive material to fill the trenches and the extended openings in the remaining mask after forming the dielectric liner; and planarizing the semiconductor substrate to remove the conductive material down to the mask; wherein conductive material remains in the openings of the layer; and the conductive material remaining in the openings of the layer forms a conductive bridge across the trenches.