A complete optimisation of the copper CVD deposition was achieved with
a bubbler delivery system. However the deposition rate was found to b
e limited to 30 nm/min. With a DLI delivery system, a major improvemen
t of the deposition rate 100 nm/min was achieved at high Cupraselect(R
) Bow rate with a void free deposition. The nucleation delay, the depo
sition rate and the reproducibility were dramatically improved by wate
r vapour addition. From the experimental results, an explanation has b
een proposed for this effect.