Method for manufacturing semiconductor device

1. A method for manufacturing a semiconductor device, comprising:

forming a gate electrode on a semiconductor substrate by interposing a gate insulation layer;

forming an insulation side wall at either lateral surface of the gate electrode;

forming a source/drain region in a surface of the semiconductor substrate at either side of the gate electrode;

forming a metal layer on the surface of the semiconductor substrate including the gate electrode;

performing a plasma treatment on the metal layer;

forming a capping material layer on the metal layer using one of physical vapor deposition and chemical vapor deposition;

performing an annealing process upon the semiconductor substrate to form a metal silicide layer on the surface of the semiconductor substrate at positions corresponding to the gate electrode and the source/drain region; and

removing the capping material layer and the metal layer left unreacted with the gate electrode and the semiconductor substrate;

wherein the forming of the metal layer, the plasma treatment, the forming of the capping material layer, and the annealing process are performed in the same chamber via an in-situ process.

2. The method as set forth in claim 1 , wherein the plasma treatment is performed using nitrogen or ammonia gas.

3. The method as set forth in claim 1 , wherein the annealing process is performed under nitrogen or ammonia atmosphere.

4. The method as set forth in claim 1 , wherein the capping material layer is formed by depositing one of a titanium layer, a nitride titanium layer, and a titanium/nitride titanium layer.

5. The method as set forth in claim 1 , wherein the metal layer is selected from the group consisting of a nickel layer, a cobalt layer, a titanium layer, a tungsten layer, a tantalum layer, and a molybdenum layer.