Patent ID: 7855138

Claim:
A method for manufacturing a semiconductor device, comprising: forming a trench in a low dielectric constant layer containing carbon formed on a substrate and a first protection insulating layer formed on said low dielectric constant layer, wherein said forming said trench includes: forming a resist layer having an opening pattern for forming a trench on said first protection insulating layer, and forming a first concave portion in said first protection insulating layer and said low dielectric constant layer using said resist layer as a mask; removing a damage layer which is formed on a sidewall of said first concave portion of said low dielectric constant layer when said first concave portion is formed; forming a second protection insulating layer over the whole surface of said substrate by a chemical vapor deposition technique to form a second concave portion in said first protection insulating layer and said low dielectric constant layer by covering the sidewall of said first concave portion in said first protection insulating layer and said low dielectric constant layer with said second protection insulating layer; and shaping said second protection insulating layer by etch back so that said trench has a sidewall where said second protection insulating layer is selectively formed on a surface of said low dielectric constant layer.