CVD TiN layers as diffusion barrier films on porous SiO2 aerogel
In this work the compatibility of MOCVD TiN barrier films on porous SiO2 aerogel as low-k dielectric was investigated. The continuity, roughness, and sheet resistance, Rs, of the barrier as well as the electrical properties of the aerogel were investigated. A continuous TiN barrier on uncapped and PECVD SiN capped aerogel exists at 30 and ?20 nm, respectively. The high surface roughness of the TiN is caused by the aerogel layer. TiN penetration into uncapped aerogel was detected in the interface region, whereas capped low-k material shows no interaction with the barrier film.
cvd tin diffusion barrier aerogel low-k dielectric