Patent ID: 9076793
Filing Date: 2015-07-07
Classification: H01L

Abstract:
1. A semiconductor device comprising: a conductive layer over a substrate; an insulating layer covering the conductive layer; a titanium film concealing at least a part of the conductive layer and covering a top surface of the insulating layer while not covering a side surface of the insulating layer in a via hole; a first titanium nitride film including first and second portions, the first portion concealing the titanium film over the part of the conductive layer, the second portion extending along the side surface of the insulating layer in the via hole, the via hole being formed in the insulating layer exposing the part of the conductive layer, the first and second portions of the first titanium nitride film having different thicknesses; a second titanium nitride film covering the first titanium nitride film at an upper part of the via hole; and a conductive plug filling in the via hole through a barrier layer that includes the titanium film, the first titanium nitride film and the second titanium nitride film.