Patent ID: 6346745
Filing Date: 2002-02-12
Classification: H01L

Abstract:
A semiconductor device comprising:an aluminum (Al) or Al alloy feature; a copper (Cu) or Cu alloy feature; and a composite electrically connecting the Al or Al alloy feature to the Cu or Cu alloy feature, the composite comprising: a first layer, comprising tantalum and aluminum, in contact with a surface of the Al or Al alloy feature; a second layer comprising tantalum nitride on the first layer; a third layer comprising tantalum nitride, having a nitrogen content less than the tantalum nitride of the second layer, on the second layer; and a fourth layer, comprising tantalum or tantalum nitride having a nitrogen content less than the tantalum nitride of the third layer, on the third layer and in contact with a surface the Cu or Cu alloy feature.