Patent ID: 6867141

Claim:
A method for forming an interlayer dielectric film by high-density plasma, using an apparatus for fabricating a semiconductor device which includes a reactor having a wafer supporter on which a semiconductor wafer is placed and a gas supplier for supplying reactant gas to the semiconductor wafer, and is used for generating high-density plasma for chemical vapor deposition, the method comprising the steps of: (a) placing the semiconductor wafer having a predetermined pattern in the reactor; (b) supplying reactant gas to the semiconductor wafer in the reactor while the reactor is maintained to have low pressure; (c) changing the reactant gas into a plasma state and bringing the plasmic reactant gas into contact with a surface of the semiconductor wafer, so that a first interlayer dielectric film is formed; (d) providing an atmospheric gas into the reactor; (e) performing a sputtering etch on the first interlayer dielectric film by changing the atmospheric gas into plasma and colliding the plasma against the wafer surface; (f) performing a wet etch on the first interlayer dielectric film after the sputtering etch; and (g) forming a second interlayer dielectric film on the first interlayer dielectric film.