Patent ID: 9105618
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate wire extending from a channel region into an element isolation region and including a laminated film in which a polysilicon film, a barrier conductive film, and a metal film are laminated in this order from a lower layer side; a first contact plug connected to a source or a drain adjacent to the channel region; a first upper layer wire arranged above the source or the drain and connected to the first contact plug; a second upper layer wire arranged above the element isolation region; a second contact plug arranged apart from the second upper layer wire and connecting the metal film and the polysilicon film above the channel region; and a third contact plug formed apart from the polysilicon film in the element isolation region and connecting the second upper layer wire and the metal film, wherein the second contact plug includes a barrier metal in contact with the polysilicon film and the barrier conductive film in the gate wire is made of at least one of tungsten nitride (WN), tantalum nitride (TaN), and tantalum (Ta) and the barrier metal in the second contact plug is made of at least one of titanium (Ti) and titanium nitride (TiN).