Patent ID: 7011864

Claim:
A method for forming a film on a substrate, comprising: coating a porous insulation film material on the substrate with a spin coat process; heating the substrate on which the porous insulation film material is coated in an air-tight closed chamber at a first temperature in an atmosphere of oxygen concentrated below 1000 ppm while the deaerating inside the chamber creating at least a reduced pressure environment so as to form a first insulation film thereon; cooling the first insulation film formed by heating the porous insulation film material; coating a non-porous insulation film material on the first insulation film with the spin coat process after cooling the first insulation film; heating the substrate on which the non-porous insulation film material after coating thereof at a second temperature lower than the first temperature in an atmosphere of oxygen concentration below 1000 ppm so as to form a second insulation film thereon; coating a porous insulation film material on the substrate on which the second insulation film is formed; and forming a third insulation film on the substrate on which the porous insulation film material is coated thereon.