Film forming method and semiconductor device manufacturing method

摘要

The present invention relates to a film forming method for forming a planarized interlayer insulating film to cover wiring layers, etc. of a semiconductor integrated circuit device. The method includes the steps of forming on a substrate 206, a phosphorus-containing insulating film 45a containing P2O3 by using a film forming gas in which an oxidizing. gas is added into a gas mixture including a phosphorus-containing compound, which has III valence phosphorus and in which oxygen is bonded to at least one bond of the III valence phosphorus, and silicon-containing compound, or by using the film forming gas from which the oxidizing gas removed, heating the phosphorus-containing insulating film 45a while applying acceleration to the insulating film 45a to fluidize the insulating film and thus planarize a surface of the insulating film 45b while the insulating film 45a has a predetermined viscosity, and heating further the insulating film 45b after the surface of the insulating film 45b has been planarized, to sublimate P2O3 in the insulating film 45b and thus solidify the insulating film 45b.