Abstract: To provide a method for manufacturing a semiconductor device, by which it is possible to form a trench or a hole with high aspect ratio on a methylsiloxane type film with low dielectric constant with causing neither via-connection failure nor short-circuit failure even when lower level interconnect is covered with etching stopper. The method comprises the processes of forming a layered film with a silicon oxide film on upper layer of a methylsiloxane type film and forming the layered film using a hard mask. When the etching stopper is etched, the silicon oxide film acts as a hard mask for the methylsiloxane type film, and transfer of faceting to the methylsiloxane type film is prevented. Thus, parasitic capacitance of multi-level interconnect can be reduced without causing via-connection failure and short failure.

Abstract: To provide a method for manufacturing a semiconductor device, by which it is possible to form a trench or a hole with high aspect ratio on a methylsiloxane type film with low dielectric constant with causing neither via-connection failure nor short-circuit failure even when lower level interconnect is covered with etching stopper. The method comprises the processes of forming a layered film with a silicon oxide film on upper layer of a methylsiloxane type film and forming the layered film using a hard mask. When the etching stopper is etched, the silicon oxide film acts as a hard mask for the methylsiloxane type film, and transfer of faceting to the methylsiloxane type film is prevented. Thus, parasitic capacitance of multi-level interconnect can be reduced without causing via-connection failure and short failure.

Abstract: To provide a method for manufacturing a semiconductor device, by which it is possible to form a trench or a hole with high aspect ratio on a methylsiloxane type film with low dielectric constant with causing neither via-connection failure nor short-circuit failure even when lower level interconnect is covered with etching stopper. The method comprises the processes of forming a layered film with a silicon oxide film on upper layer of a methylsiloxane type film and forming the layered film using a hard mask. When the etching stopper is etched, the silicon oxide film acts as a hard mask for the methylsiloxane type film, and transfer of faceting to the methylsiloxane type film is prevented. Thus, parasitic capacitance of multi-level interconnect can be reduced without causing via-connection failure and short failure.

Abstract: An intermetal insulating film containing at least silicon atoms, oxygen atoms and carbon atoms with the number ratio of oxygen atom to silicon atom being 1.5 or more and the number ratio of carbon atom to silicon atom being 1 to 2, and having a film thickness shrinkage at a time of oxidation of 14% or less is very low in dielectric constant, high in selectivity against resist etching and can be used without using a silicon oxide protective film in a semiconductor device.

Abstract: An intermetal insulating film containing at least silicon atoms, oxygen atoms and carbon atoms with the number ratio of oxygen atom to silicon atom being 1.5 or more and the number ratio of carbon atom to silicon atom being 1 to 2, and having a film thickness shrinkage at a time of oxidation of 14% or less is very low in dielectric constant, high in selectivity against resist etching and can be used without using a silicon oxide protective film in a semiconductor device.

Abstract: To provide a method for manufacturing a semiconductor device, by which it is possible to form a trench or a hole with high aspect ratio on a methylsiloxane type film with low dielectric constant with causing neither via-connection failure nor short-circuit failure even when lower level interconnect is covered with etching stopper. The method comprises the processes of forming a layered film with a silicon oxide film on upper layer of a methylsiloxane type film and forming the layered film using a hard mask. When the etching stopper is etched, the silicon oxide film acts as a hard mask for the methylsiloxane type film, and transfer of faceting to the methylsiloxane type film is prevented. Thus, parasitic capacitance of multi-level interconnect can be reduced without causing via-connection failure and short failure.

Abstract: An intermetal insulating film containing at least silicon atoms, oxygen atoms and carbon atoms with the number ratio of oxygen atom to silicon atom being 1.5 or more and the number ratio of carbon atom to silicon atom being 1 to 2, and having a film thickness shrinkage at a time of oxidation of 14% or less is very low in dielectric constant, high in selectivity against resist etching and can be used without using a silicon oxide protective film in a semiconductor device.