Patent ID: 7229910

Claim:
A method of forming a multi-layered insulation film on a semiconductor wafer, comprising: forming by a spin-coating method a first insulation layer comprising methyl silsesquioxane (MSQ); after said forming said first insulation layer, thermally treating said first insulation layer to improve an adhesion of said first insulation layer with said second insulation layer; forming a second insulation layer comprising a polysiloxane compound having an Si—H group such that the second insulation layer is in contact with a top of the first insulation layer; forming a third insulation layer comprising an inorganic material such that the third insulation layer is in contact with a top of the second insulation layer; and after forming said third insulation layer, forming a plurality of grooves in said first, second and third insulation layers, wherein said polysiloxane compound comprises methylated hydrogen silsesquioxane (MHSQ), and wherein said second insulation layer improves an adhesion property between said first and third insulation layers.