Semiconductor device

A semiconductor device comprising:

• a substrate;
• a first interlayer insulating layer disposed on the substrate;
• a via trench formed in the first interlayer insulating layer;
• a via filling layer filling the via trench;
• a second interlayer insulating layer in contact with an upper surface of the first interlayer insulating layer on the first interlayer insulating layer, the second interlayer insulating layer including a material different from a material included in the first interlayer insulating layer;
• an upper wiring trench formed on the via trench in the second interlayer insulating layer;
• and
• an upper wiring pattern in contact with an upper surface of the via filling layer, the upper wiring pattern filling the upper wiring trench, the upper wiring pattern including a first upper wiring barrier layer disposed on sidewalls of the upper wiring trench, a second upper wiring barrier layer disposed on sidewalls of the first upper wiring barrier layer and the upper surface of the via filling layer, an upper wiring filling layer disposed on the second upper wiring barrier layer, and an interface layer disposed between the first upper wiring barrier layer and the second upper wiring barrier layer and between the upper surface of the via filling layer and the second upper wiring barrier layer,
• wherein the via filling layer and the first upper wiring barrier layer include the same material.

A semiconductor device comprising:

• a substrate;
• a first interlayer insulating layer disposed on the substrate;
• a lower wiring pattern disposed in the first interlayer insulating layer;
• a second interlayer insulating layer disposed on the first interlayer insulating layer, the second interlayer insulating layer including tetraethyl orthosilicate (TEOS);
• a via trench formed in the second interlayer insulating layer, the via trench extending to an upper surface of the lower wiring pattern;
• a via filling layer filling the via trench;
• a third interlayer insulating layer in contact with an upper surface of the second interlayer insulating layer on the second interlayer insulating layer, the third interlayer insulating layer including a low dielectric constant material different from tetraethyl orthosilicate (TEOS);
• an upper wiring trench formed on the via trench in the third interlayer insulating layer;
• and
• an upper wiring pattern in contact with an upper surface of the via filling layer, the upper wiring pattern filling the upper wiring trench, the upper wiring pattern including a first upper wiring barrier layer disposed on sidewalls of the upper wiring trench, a second upper wiring barrier layer disposed on sidewalls of the first upper wiring barrier layer and the upper surface of the via filling layer, an upper wiring filling layer disposed on the second upper wiring barrier layer, and an interface layer disposed between the first upper wiring barrier layer and the second upper wiring barrier layer and between the upper surface of the via filling layer and the second upper wiring barrier layer,
• wherein each of the via filling layer and the first upper wiring barrier layer includes molybdenum (Mo),
• wherein at least a portion of the second upper wiring barrier layer is in contact with the upper surface of the second interlayer insulating layer in the upper wiring trench, and
• wherein at least a portion of the upper surface of the via filling layer is formed to be higher than the upper surface of the second interlayer insulating layer.