Patent ID: 9449869
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A method for fabricating an interconnect structure, comprising: forming a carbon-containing dielectric layer on a substrate by treating a dielectric material on the substrate using ultraviolet (UV) light in a UV-treatment chamber, wherein the carbon-containing dielectric layer is made of a material consisting of SiCOH, SiCO, and SiCON; forming a protective layer on the carbon-containing dielectric layer to prevent carbon loss from the carbon-containing dielectric layer by in-situ performing, in the UV-treatment chamber, a surface treatment to the carbon-containing dielectric layer using a gas at least containing silicon and hydrogen; forming a hard mask layer on the protective layer using a non-oxygen plasma in a plasma-enhanced deposition to further prevent carbon in the carbon-containing dielectric layer from reacting with oxygen during the plasma-enhanced deposition; and forming a through hole in the carbon-containing dielectric layer using the hard mask layer as a mask to expose a surface of the substrate for forming a contact plug in the through hole.