Patent ID: 9053985
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; n conductive layers stacked on the substrate and connected to each other through a contact pattern formed in a contact hole, where n is at least four and the conductive layers include (n−1) interlayer insulation films, at least a portion of each (n−1) interlayer insulation film is formed between two adjacent conductive layers of the n conductive layers, an outermost interlayer insulation film serving as the (n−1)th interlayer insulation layer; and wherein the outermost conductive layer is formed over a portion of the first conductive layer, over a portion of the second conductive layer, and over portions of the outermost interlayer insulation film, and is formed in contact with only one outermost side edge portion of the second conductive layer that is positioned over the first conductive layer, wherein the first conductive layer and the second conductive layer are connected electrically to each other by the nth conductive layer, wherein a portion of an innermost interlayer insulation film is formed on the first conductive layer, the second conductive layer is formed directly on the innermost interlayer insulation film, and wherein the contact hole includes a first sub-contact hole located between the innermost interlayer insulation film in plan view, and a second sub-contact hole located in plan view between the second conductive layer and a second interlayer insulation film that is formed directly on the innermost insulation film, the first and second sub-contact holes being filled with the outermost conductive layer, and the second sub-contact hole being recessed beneath an upper surface of the second conductive layer and having a diameter smaller than a diameter of the contact hole, at least a portion of the second sub-contact hole being located outside of an area occupied by the first sub-contact hole in plan view.