Patent ID: 7718005

Claim:
A film forming apparatus comprising: a processing chamber; a gas exhaust system for exhausting an inner atmosphere of the processing chamber; a mounting table having a mounting surface for mounting thereon a flat target object, the mounting table being provided in the processing chamber; a gas supply system for supplying a processing gas containing a film forming gas into the processing chamber, a heater for heating the target object on the mounting table; a clamp device for pressing and releasing the target object with respect to the mounting table by contacting with and separating from a peripheral portion of a surface of the target object; an adsorption structure formed on the mounting surface of the mounting table for adsorbing the target object temporarily by means of a pressure difference caused by substantially sealed spaces defined between a backside of the target object and the mounting surface of the mounting table; and a controller which controls the gas exhaust system, the gas supply system, the heater, and the clamp device to perform the steps of: (a) adjusting the pressure in the processing chamber to an initial pressure; (b) forming a first thin film on the surface of the target object, which includes the sub-steps of(b1) adsorbing the target object on the mounting table with the help of the adsorption structure by adjusting the inner pressure of the processing chamber to a level higher than the initial pressure while the clamp device is separated from the target object; and (b2) forming the first thin film by supplying a first processing gas into the processing chamber while heating the target object adsorbed on the mounting table; and (c) forming a second thin film on the first thin film, which includes the sub-steps of(c1) pressing the target object against the mounting table by making the clamp device contact with the target object; and (c2) forming the second thin film by supplying a second processing gas into the processing chamber while heating the target object pressed against the mounting table.