Patent ID: 7265064

Claim:
A method of manufacturing a semiconductor device, comprising: forming semiconductor circuit elements or wiring patterns on a semiconductor substrate; and forming a porous silicon oxide film as an interlayer insulating film on said semiconductor substrate including said semiconductor circuit elements or wiring patterns by oxidizing silicon in a mixture gas containing an oxygen gas in a chamber, wherein the forming of the porous semiconductor oxide film includes supplying said mixture gas containing said oxygen into the chamber and vaporizing the silicon in the chamber, said mixture gas being at a pressure which is changed while said mixture gas is supplied, wherein said pressure of said mixture gas is set to a first pressure value in a range of 0.3 Torr to 10 Torr and then to a second pressure value in a range of 0.3 Torr to 10 Torr, the second pressure value being greater than the first pressure value.