Patent ID: 7655549

Claim:
A method of fabricating a metal gate of a transistor in a substrate processing system which comprises a wafer transfer module provided with a transfer unit for transferring a wafer, a thermal annealing module, a cooling module, a first PVD module, and a second PVD module, all of which are respectively connected to the wafer transfer module, the method comprising: a first step of transferring a wafer substrate through the wafer transfer module into the thermal annealing module by using the transfer unit; a second step of forming an SiO 2 film on the wafer substrate in the thermal annealing module; a third step of transferring the wafer substrate, on which the SiO 2 is formed, through the wafer transfer module into the cooling module by using the transfer unit; a fourth step of cooling the wafer substrate, on which the SiO 2 is formed, in the cooling module; a fifth step of transferring the wafer substrate subjected to the cooling by the fourth step, through the wafer transfer module into the first PVD module by using the transfer unit; a sixth step of forming a metal film on the SiO 2 film in the first PVD module; a seventh step of transferring the wafer substrate, on which the metal film is formed, through the wafer transfer module into the thermal annealing module by using the transfer unit; an eighth step of thermally annealing the wafer substrate, on which the metal film is formed, in the thermal annealing module to transform the metal film into a high dielectric film; a ninth step of transferring the wafer substrate, on which the high dielectric film is formed, through the wafer transfer module into the cooling module by the transfer unit by using the transfer unit; a tenth step of cooling the wafer substrate, on which the high dielectric film is formed, in the cooling module; an eleventh step of transferring the wafer substrate subjected to the cooling by the tenth step, through the wafer transfer module into the second PVD module by using the transfer unit; and a twelfth step of forming a metal electrode on the high dielectric film; wherein the first step to the twelfth step are sequentially conducted without exposing the formed SiO 2 film, formed metal film and formed high dielectric film to an ambient atmosphere by transferring the wafer substrate in a vacuum environment from one module to another module through the wafer transfer module.