Patent ID: 7977794

Claim:
An aluminum line of a semiconductor device comprising: a first stage metal line formed by sequentially applying a first A metal thin layer, a first aluminum layer, a first B metal thin layer, and an intermetallic dielectric layer on an interlayer insulating layer, wherein the first A metal thin layer, which is one of a single layer being formed of one of titanium and titanium nitride and a double layer being formed of titanium and titanium nitride, includes the first stage metal thin layer further formed by performing a photolithography process on a resulting structure to form a first metal line pattern, and performing a chemical mechanical planarization process to remove the first B metal thin layer; and a second stage metal line formed by sequentially applying, on the first stage metal line, a second aluminum layer and a second metal thin layer formed as a double layer of titanium and titanium nitride, performing a photolithography process to form a second metal line pattern which is the same as the first metal line pattern, applying a second intermetallic dielectric layer, and performing a chemical mechanical planarization process to remove the second intermetallic dielectric layer, wherein the second aluminum layer is in direct contact with the first aluminum layer, and wherein the first A metal thin layer and the first aluminum layer have a substantially same width.