Patent ID: 7052971

Claim:
A method for manufacturing a semiconductor device, comprising: forming a first silicon oxide film by high density plasma chemical vapor deposition (to be referred to as HDP-CVD hereinafter) so as to bury a recess portion in a three-dimensional portion formed in a surface region of a semiconductor workpiece to a position lower than an upper surface of the recess portion; and forming a second silicon oxide film by spin on glass (to be referred to as SOG hereinafter) on the first silicon oxide film so as to fill the recess portion; wherein D (nm) is a depth of the recess portion in the three-dimensional portion and W (nm) is a width on the upper surface of the recess portion, and when one recess portion is present, the recess portion satisfies W≦100 nm and D/W≧4.5, and when a plurality of recess portions are present, at least one recess portion satisfies W≦100 nm and D/W≧4.5; and wherein Wmin is a width of one of the recess portions, which has the smallest width, Tb is a thickness of the first silicon oxide film on the bottom surface in the recess portion, and the first silicon oxide film is formed to a thickness that satisfies Tb/Wmin<4.5.