Patent ID: 7825510
Filing Date: 2010-11-02
Classification: H01L

Abstract:
1. An integrated circuit comprising: an adhesion layer comprising a base layer, an intermediate layer, and a covering layer, the adhesion layer arranged in at least one contact hole, the covering layer and the base layer each comprising titanium nitride, wherein the base layer adjoins a connecting section exposed by the contact hole, the connecting section comprising one of substantially nitride-free aluminum or an aluminum alloy, and wherein the base layer resides between the connecting section and the covering layer, wherein the intermediate layer comprises a continuously spatially varying concentration of titanium contacting the base layer and the covering layer, such that a titanium nitride material contacts the base layer and a substantially pure titanium material contacts the covering layer, and a filling material comprising tungsten overlying the adhesion layer and filling the contact hole, wherein the covering layer at a bottom of the contact hole has a thickness of less than about 10 nm.