Patent ID: 7282437

Claim:
A method of manufacturing a semiconductor device comprising: depositing a first interlayer insulating film on a substrate; depositing an underlying insulating film on the interlayer insulating film; depositing a porous-low-k film on the underlying insulating film; depositing a low-k film on the porous-low-k film; etching the porous-low-k film and the low-k film so as to provide a groove and changing chemical compositions of a residual part of the porous-low-k film and a residual part of the low-k film, and forming first and second sidewall insulating films at sidewall portions of the residual porous-low-k film, and forming first and second side-beams at the sidewall portions of the residual low-k film; and removing a central portion of the residual porous-low-k film formed between the first and second sidewall insulating films.