Patent ID: 9721892
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A method for manufacturing a semiconductor device, the method comprising: providing a semiconductor substrate; forming a porous low-k dielectric layer on the semiconductor substrate; forming a through-hole and a trench of a copper interconnect structure; performing a helium plasma treatment on an exposed surface of the porous low-k dielectric layer; performing a nitrogen-containing plasma treatment on the exposed surface of the porous low-k dielectric layer to form a silicon nitride layer; performing a krypton plasma treatment to the silicon nitride layer; and forming a diffusion barrier layer on bottoms and sidewalls of the through-hole and the trench of the copper interconnect structure, wherein the krypton plasma treatment is performed at a flow rate in a range between 100 and 10,000 sccm, a power in a range between 50 and 5000 W, and a pressure in a range between 0.1 mTorr and 10 Torr.