Patent ID: 7372163
Filing Date: 2008-05-13
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first interconnection layer provided on a semiconductor substrate; an interlevel insulation film provided over the first interconnection layer, the interlevel insulation film having an interlevel connection opening formed therein; a second interconnection layer of gold provided on the interlevel insulation film; and a barrier layer provided between the first and second interconnection layers in the interlevel connection opening, the barrier layer including a first sublayer provided in contact with the first interconnection layer to reduce a contact resistance, a second sublayer provided in contact with the second interconnection layer to improve a bonding strength, and a third sublayer provided between the first and second sublayers, the third sublayer containing nitrogen atoms, the third sublayer having a nitrogen atom density distribution such that a portion of the third sublayer adjacent to the first sublayer has a lower nitrogen atom density than a portion of the third sublayer adjacent to the second sublayer; the interlevel insulation film being formed to continuously bridge, without interruption, a side and a top of the first interconnection layer, a portion of the interlevel insulation film on the top of the first interconnection layer being provided between the first and second interconnection layers.