A fully encapsulated copper interconnect with CoWP barrier and protection layer can be produced by conformal electroless CoWP barrier layer deposition at the bottom and on the sidewalls of trenches and selective electroless CoWP deposition on in-laid Cu lines. The electroless CoWP deposition is an autocatalytic reaction with activation energy of about 0.985 eV. Deposition rate of about 10 nm/min at 80 °C and average surface roughness of 5 nm for 200 nm thick films were measured. CoWP layer with resistivity of 25 μOhms·cm was obtained. Resistivity of electroless CoWP films was decreased from 25 μOhms·cm to 20 μOhms·cm after annealing in vacuum with 10-7 torr at 400 °C for 30 min. The RBS spectra of the Cu/CoWP/Co/Si structure formed by electroless CoWP barrier and Cu deposition and annealed at 400 °C for 60 min in vacuum 10-7 torr showed no interdiffusion in deposited films.
|Number of pages||6|
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - 1997|
|Event||Proceedings of the 1996 MRS Fall Meeting - Boston, MA, USA|
Duration: 2 Dec 1996 → 5 Dec 1996