Patent ID: 6709950
Filing Date: 2004-03-23
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising:a first step of forming a trench isolation on a semiconductor substrate, the trench isolation having a top surface at a higher level than a surface of the semiconductor substrate; a second step of forming a gate insulating film on an active area surrounded by the trench isolation on the semiconductor substrate; a third step of forming a gate electrode on the gate insulating film and forming an interconnection on the trench islation; after the third step, a fourth step of forming an underlying film on the entire surface of the semiconductor substrate; a fifth step of forming an interlayer insulating film on the underlying film; a sixth step of forming a hole stretching over at least a part of the active area, at least a part of the interconnection and at least a part of the trench islation providided therebetween by selectively removing the interlayer insulating film and the underlying film; and a seventh step of forming a buried conductive layer by filling the hole with a conductive material, wherein the underlying film is made of an insulating material having high etching selectivity against the interlayer insulating film in a dry etching process.